UMP pistol arm brace, designed to fit the US made TMP receiver and any other pistol that uses the UMP style hinge. This arm brace is designed to fold and latch on the TMP platform and clears the ejection port. The length of pull is under the ATF suggested maximum length of 13.5 in. If you use this on a different platform, keep in mind the length of pull needs to be under 13.5 in. This is a single flap, hard polymer design with an adjustable strap for left and right handed users. Do not use this product on the USC rifle. All USC's are rifles. There is no pistol option. WARNING!!!!! Currently the ATF is going back and fourth on braces saying they do not regulate accessories however they want each platform submitted with the brace installed for evaluation but they haven't approved anything since 2018 so these are use at your own risk.