SAVE THESE INSTRUCTIONS IN YOUR BROWNELLS DATA RING BINDER 1.0 underlug or rib, (if present). barrel vise with blocks fitted to the barrel will prevent damage to the sight, tion wrench on the frame to avoid springing or damaging the frame. Use of a necessary for the work being performed. Be sure to use a properly fitted ac is 2.0 076-200-319 is aligned with the vertical axis of the frame. new barrels, to adjust the “draw” of the barrel protrude farther so into the that frame opening.the front The Fixture sight is also used for fitting from the barrel muzzle to the barrel shoulder. sive This barrel-cylinder gap.allows the “Set Back”barrel is shank the to process of shortening the not distance have a lathe, to enable him to set back revolver barrels to correct exces WARNING! BEFORE STARTING ANY WORK: solely rely on the general advice and warnings given. it would be best to seek out specific advice from other sources and not general.is porated application specific a to as question any is there If similarly constructed . proceed basing your procedures on common sense and experience with you have a need to disassemble or reassemble the firearm, you should sufficient knowledge. If such alternative sources are not available and consult other reference sources such as reference books should you or then all, persons at available not with are they available.If are they if see to manufacturer the available,contact immediately not are tions sembly should follow the manufacturer’s instructions. If such instruc reas and Disassembly firearm. the in remains ammunition no that , the magazine and firing mechanism to be absolutely certain unloaded.and empty is it that certain the Visuallyabsolutely inspect Brownells Barrel Set Back Fixture is designed for the who does just touches the back of the Pilot Carrier.Pilot the backtouchesof the just Depth The Screw Adjustment and tighten the Depth Adjustment Screw boreline. on the the back of to the Body until angle it slight a 2.4 at Cutter the of side the leaves this if boreline,barrel’seven the to angles right at positioned is Cutter the of edge front the that sure make Cutters, carbide the in differences ance toler of possibility the to Due threads! barrel the touch to Cutter the want NOT DO YouNote: Screw.Important Clamp the the against lock Cutter also to and threads turn, barrel the a off Cutter of the 1/16th raise slightly additional very an Screws Cutter. Depth the Cutter touch just the head Tighten the “feel” you until Screw Clamp the Body.Tighten Cutter the in recess cutter the of bottom the touch to just ting tip against the , and adjust the Cutter Depth Screws cut carbide Cutter’s the Hold hole.it’s into threads two or one turned 2.3 ger Redhawk Ru as such barrels, large-shanked Screw,while Clamp Short the use & Wesson K & L frames, most Colts, and Ruger diameter.shank barrel Smith barrels,on as Small-shanked suchbased need will you Screw Clamp Cutter Body.which the Determine of back the on Locknut Screw Adjustment Depth Body.the the Loosen in hole 2.2 Fixture. the into barrel the push to able be will you that so it position type, base swivel a is vise your If jaws. vise the of side about one positioned with flush shank barrel the for hole large the with vise, padded bench or jawed smooth a in Body the clamp body,and Fixture Back Set the from Cutter the binding.Remove without barrel the enter will rier, and lock in place with the setscrew. Make sure that 2.1 the Pilot selected Smith & Wesson . Brownells special taps will clean up most frame thread irregularities in are noticed, stone this face square with the threaded section of the frame. ridges due to previous overtightening of the barrel. If any irregularities area is prone to cracking. Inspect the front face of the frame for this burrs or - frame the fits crane the where revolvers action double on barrel the below area thin damage.very for the threads Payto attention close 1.1 TOOL SET-UP FRAME PREPARATION With regard to the use of these tools,these Incor of Brownells use of the advice to Withthe regard Never attempt to disassemble or reassemble a firearm unless you are

m With the barrel removed from the frame, closely inspect the frame the inspect closelyframe, the from removed barrel the With Touch barrel’s shoulder lightly against the front edge of the Cutter the of edge front the against lightly Touchshoulder barrel’s Set the Cutter into it’s recess in the Body, with the Clamp Screw Clamp the Body,with the in recess it’s into Cutter the Set its into Carrier Pilot the slip and barrel the into Pilot the Insert Insert the proper Pilot to match the barrel’s bore into the Pilot Car EMPTY R107 ® and Smith & Wesson N frames, will need the Long Screw. and UNLOADED. HOW TO USE WARNING Disassemble the firearm to the degree the to firearm the Disassemble Make absolutely sure that the ® Security-Six m ® series will ©

2007 2007 BROWNELLS, INC. ------

3.0 point. desired third,the a second,to even barrel or the “clean-up”bring to cut a make Body.the against Nut Lock the tighten to wrench end open or crescent Hold the Depth Adjustment Screw in the desired position and use a mately small .027" (¾ of .036"), setting the barrel back the appropriate amount. three-quarters of a turn will move the Depth Adjustment Screw approxi set back one turn (about .028"). Turning the Depth Adjustment Screw & Wesson barrel, with 36 threads per inch on the barrel shank, has to be is threaded ¼"-28, each full turn will move it .036". For example: A Smith

from the shoulder to get this 1/10th to 1/8th of a turn “draw.” It may be necessary to cut off slightly 1/8th of a turn to bring the front sight need vertical,should barrel shoulder.the tightened,the or hand from When “square” with the frame. check the barrel in the frame, until you have cut the calculated amount to frequently shoulder,stopping the cutting Continue frame. the from frame,the in it barrel unscrew face.the and frame of position the Note frame. Turn the barrel in, by hand, until the shoulder gently touches the shoulder, clean off chips and oil from the barrel and try it in the revolver Cutter the from chips area. shoulder barrel the shank,to barrel Do-Drill and fresh apply and clear to frequently cutting Stop edge. cutting backwards against the Cutter, as you will probably damage the carbide Cutter,a the in of edge ting cut the into it turn and barrel, the to pressure even light,der. Apply shoul barrel’s the on Do-Drill, Brownells as such oil, cutting “good quality” plenty Use others. than differently quite cut will barrels Some 3.2 muzzle). the (towards forward cut be to have will shoulder barrel the inch per To endshake. cylinder divide turn; one back barrel and the set headspace pres gap excessive barrel-cylinder correcting excessive after the ent correct turn. to full turn 1 one back back set barrel the set to removed be must that metal amount of approximate the is This turn. full each per moves barrel the first listed, inch not Divide one shank. barrel is the on inch revolver per threads of your number the measure If instructions. these with cluded in chart the checking by back set be to have will shoulder barrel the 3.1

SETTING BACK BARRELS NOTE: Set up the Depth Adjustment Screw so that the Cutter will Cutter the that so Screw Adjustment Depth the up Set NOTE: After about half of the calculated amount of metal has been cut from the Example: A Smith & Wesson Model 19 (K-Frame) needs the barrel the needs (K-Frame) 19 Model Wesson & Smith A Example:

arl tes ay ut a i i ter ades n toughness. and hardness their in bit a quite vary steels Barrel Determining Amount Of Set Back. shallower (36), The answer of .0277" (round off to .028") is the amount the is .028") to off (round .0277" of answer The (36), y the by ubr f hed pr inch per threods of number cut than you have computed to be necessary.be to computed have a you Make than cut 800-741-0015 Firearms AccessoriesGunsmithing and Tools.™ 200 S. Front St. Montezuma, IA Montezuma, St. Front S. 200 INSTRUCTIONS SET-BACK READ FIXTURE clockwise BARREL World’sof LargestSupplier

or &

641-623-4000 • 641-623-4000 one inch one more FOLLOW direction. You can calculate how much than the calculated amount by the by o id h aon that amount the find to www.brownells.com THESE Never

number of threods of number 50171 MADE turn the barrel the turn

IN U.S.A. 1/10 out to - - - - -

Important: Too much “draw” may cause damage to the frame and rections sent with the Revolver Chamfering Tool Kit for details barrel. Too little “draw” may cause the barrel to shoot loose, jam- on setting the barrel cylinder gap and cutting the forcing cone. ming the gun as the underside of the barrel, and any underlugs, 5.2 Refitting Ejector Rods. On Smith & Wesson, Ruger and other bind against the extractor rod. The gun may also have excessive spit- revolvers with a front lockup that engages the Ejector Rod end, the ting from the barrel-cylinder gap and, the front sight will be “out of Ejector Rod and Center Pin will have to be shortened and refitted after square” with the frame, causing a point-of-impact change at the target. barrel set back. Make a sketch of the Ejector Rod end so that you can If the hardness/toughness of the barrel has caused the Cutter to duplicate the contours after the length has been adjusted. Determine chatter, several turns of the barrel against the Cuttec, with the pilot the amount to be removed to allow proper closing of the cylinder - this Carrier touching the Depth Adjustment Screw, will usually clean up should be approximately the same amount that the barrel was set the shoulder. A small triangular stone may be used for final dressing back. The length can be determined by measuring from the end with a of the shoulder area. dial caliper or depth mike, and placing a wrap of masking tape around 3.3 Refitting The Barrel. If the barrel has an under-rib, the Ejector Rod at that point. Hand file the knurled end or chuck the or a shrouded ejector rod, (as used on S&W Model 19 revolv- rod into a drill press chuck, use a fine cut file, and cut back the end ers, S&W L and N frame models, Colt Pythons, Diamondbacks, of the rod until the file just touches the masking tape. (Make sure and other), the rib or shroud will have to be relieved where it that any file used around moving machinery, such as a drill press or butts up to the frame so that the crane does not hit it on closing. lathe, has a handle attached to the tang!) File a bevel on the rod to Clean both the threaded shank of the barrel and the frame, using duplicate the factory bevel - refer back to the sketch you made ear- a good solvent. Make certain that there are no chips left on either lier. Shorten the Center Pin until the front lockup seats properly and piece. Apply a small amount of gun oil, light grease, or a commercial will fit flush, or slightly beyond flush, with the end of the Ejector Rod anti-sieze compound to the threads on the barrel, and hand tighten it when the Cylinder Latch thumbpiece is operated to open the cylinder. into the frame. Place the barrel into the barrel vise, and use a prop- If a barrel has been set back on a single action revolver, the Ejec- erly fitted action wrench to tighten the barrel so that the front sight tor Tube or Housing will have to be refitted along with the Ejector is aligned with the vertical axis of the frame. Important: DO NOT Rod. Most single action revolvers use a smaller diameter rebated TIGHTEN THE BARREL PAST THE 12 O’CLOCK POSITION, or section on the end of the Housing that fits a recess in the Frame. it will have to be refitted. This rebated section will have to be filed forward, towards the muzzle 3.4 Refer to Section 5.0 for the “Finishing Touches” to complete the end of the housing, by about the same ameunt the barrel has been job. set back. The Ejector Rod will also have to be shortened, but by as 4.0 FITTING NEW BARRELS little as possible. Leave the Ejector Rod as long as possible to get 4.1 Fitting new factory and after market target barrels is similar to the maximum stroke for ejecting empty cases. The end of the Ejec- setting back existing barrels. Prepare the frame carefully, making abso- tor Rod should not protrude into the Frame opening or “window”. lutely certain that there is no dirt or crud in the frame threads or on the 5.3 Detailing Out The Job. Any bare metal showing from the bar- face of the frame. Clean and lightly lubricate the new barrel’s threads, rel set back job, such as the frame face and the end of the ejector rod, and attempt to hand fit the barrel to the frame. If the barrel fits the frame should be carefully cleaned of greases and oil, and touched-up with a threads tightly to the point that the barrel binds, the frame and/or barrel good touch-up blue like Brownells Dicropan T-4. threads may need to be cleaned up with an appropriate sized tap or die. Reassemble the firearm according to the manufacturer’s instructions. The new barrel will usually stop in the frame with the front sight (or Check for proper functioning using ACTION PROVING DUMMIES. Make top of a bull barrel blank) between the 6 o’clock and 3 o’clock positions . . sure ALL SAFETY MECHANISMS are fully functional as designed and . in other words, about one-half to one-quarter turn from the proper, fin- approved by the manufacturer. If these tests prove satisfactory, test-fire ished position. Determine, as closely as possible, the stopping point of the firearm with live ammunition in a SAFE and APPROPRIATE manner. the barrel as a fraction . . . that is; lacking ½ turn, 3/8 of a turn, or whatever. IMPORTANT! Start the live ammunition tests by first loading an ACTION As with a barrel set back job, you want the new barrel to hand tighten to PROVING DUMMY, then a live round, into the magazine. Only after sev- within 1/8th to 1/10th of a turn. You will have to compute the difference eral tests have been conducted in this manner should additional rounds between the hand tightened position of the new barrel and the desired be placed in the magazine and fired. stopping point, to get the 1/8th to 1/10th of a turn “draw” on the barrel. Example: A Ruger Security-Six is being fitted with a new Bull DEPTH ADJUSTMENT Barrel. The barrel hand tightens to the 5 o’clock position, lacking & BARREL THREAD MOVEMENT about 42% (4/l0ths is close enough) of turning up to the 12 o’clock point. You want the barrel to hand tighten to about 1/10th of a turn. Movement figures are approximate; manufacturing tolerances may Since the Ruger is threaded 24 threads per inch, each turn ad- affect actual movement. Double check amount of movement with depth vances the barrel about .042". You will need to remove about 30% micrometer or dial caliper. (3/10ths/ of .042", or about .0126", from the barrel shoulder to get the barrel to stop at the 1/10th turn position when hand tightened. The barrel lacks 4/10ths of a turn of tightening to the vertical po- DEPTH ADJUSTMENT SCREW CHART sition. You want it to stop at the 1/10th position. 4/10 minus 1/10 Each Full Turn Moves Screw .036" equals 3/10, or 30% of the distance each full turn moves the barrel. 4.2 Adjust the cutter as described in Section 2.0. Loosen the Depth Ad- TURN MOVEMENT TURN MOVEMENT 5 justment Screw locknut to just touch the Pilot Carrier and set the Depth ¹⁄8" .0045" ⁄8" .0225" Adjustment Screw. Use a depth micrometer or dial caliper to measure ¼" .009" ¾" .027" 7 the distance the Depth Adjustment Screw protrudes from the Fixture ³⁄8" .0135" ⁄8" .0315" Body, and write this down. Since our example job needs to move the ½" .018" 1" .036" barrel shoulder forward about .0126", back out the Adjustment Screw a bit less than the desired amount (about .009" would be right) using the dial caliper to confirm the distance moved. Lock the Depth Adjustment BARREL THREAD CHART Screw with the Locknut. Use plenty of cutting oil on the barrel shoulder and Cutter, and make the cut. Remove the barrel from the Fixture and # THREADS MOVEMENT PER clean the barrel shank and shoulder of all chips and cutting oil. Screw MAKE & MODEL PER INCH FULL TURN, INCHES the barrel into the frame hand tight, and note where it turns up to. You S&W J Frames 36 .028 should still lack a bit of coming up to the 1/8 to 1/10th turn position. S&W K Frames 36 .028 Readjust the Depth Adjustment Screw and take another, very light cut S&W L Frames 36 .028 on the barrel shoulder. Clean off and try the barrel in the frame again. S&W N Frames 36 .028 4.3 From this point, proceed as you would for a barrel set back job, Ruger “Six” Series 24 .042 ® paying very close attention to the barrel-cylinder gap adjustment. Ruger GP-100 24 .042 ® Refer to Section 5.0 for the “Finishing Touches” to complete the job. Ruger Redhawk 20 .050 ® If you are fitting a bull barrel, fit the front sight or sight rib and the Ruger Blackhawk 24 .042 underlug, if used, after the barrel has been fitted to the frame and Colt Python 32 .031 function tested/test-fired. Colt Trooper (J, V & AA) 36 .028 Colt SAA (Old Model) 20 .050 5.0 FINISHING TOUCHES CoIt SAA (New Model) 24 .042 5.1 Setting Barrel-Cylinder Gap & Recutting the Forcing Colt 1917 20 .050 Cone. We recommend using Brownells Revolver Chamfering Tool, 90º Facing Cutter to set the barrel-cylinder gap. The minimum bar- rel-cylinder gap is usually .004" and the maximum recommended gap is only .008". Extreme care must be taken not to cut the barrel at an improper angle to the bore, or cut the barrel face too far forward. After the barrel-cylinder gap has been properly set, cut or re-cut the forcing cone. If you are setting back a Ruger .38/.357 barrel with a 5° angle, you will have to use this same angle on the forc- ing cone. If you have set back the barrel on a Colt or S&W, or most other revolvers, you can use either the 18° or 11° cutter. See the di-

MADE IN U.S.A. © 2007 BROWNELLS, INC