Examples of Equipment that are not allowed IMTCA Rules 2019 Rulebook This is an example of a Gag Bit/Combination Headstall. There are many other styles that fall under the same category. Gag Bits/Combination Headstall of any style are not allowed when competing under IMTCA Rules. This is an example of a Mechanical Hackamore. There are other styles that fall under the same category. Mechanical Hackamores of any style are not allowed when competing under IMTCA Rules. This is an example of a Compression Headstall, also known as Bitless Bridle. There are other styles that fall under the same category. Compression Headstalls of any style are not allowed when competing under IMTCA Rules. This is an example of a Compression Headstall, also known as Bitless Bridle. There are other styles that fall under the same category. Compression Headstalls of any style are not allowed when competing under IMTCA Rules. This is an example of a Gag Bit. There are many other styles that fall under the same category. Gag Bits of any style are not allowed when competing under IMTCA Rules. This is an example of a Gag Bit. There are many other styles that fall under the same category. Gag Bits of any style are not allowed when competing under IMTCA Rules. This is an example of a Gag Bit. There are many other styles that fall under the same category. Gag Bits of any style are not allowed when competing under IMTCA Rules. .