Gemtech LID ( suppressor booster ) in 1/2 x 28 for sale. $130 plus shipping usually 6 bucks for flat rate box or pickup in ATL Decatur area It is new in package unused I bought this new a couple a months ago but i now realize i needed different thread pattern. It has same thread pattern as liberty LID's and fits their suppressors as well as many Gemtech models these are commonly used when making your own suppressor perfectly legal to buy and own. link to description http://www.gem-tech.com/store/pc/L-I-D-Linear-Inertial-Decoupler-p96.htm Our Linear Inertial Decoupler (LID) device is intended for use with suppressor. It is required for all handguns that utilize the Browning-type action (Glock, Sig, HK, etc.) The use of the LID allows the pistol to properly cycle when the weight of the suppressor is added to the end of the barrel. Threaded 1/2-28.