Features: Drop in nozzle for PolarStar JACK HPA engines Machined Delrin construction Material: Machined DelrinManufacturer: PolarStar Num Most Commonly Used With Tip OAL 1 TM M4/M16, A&K PKM, TM MP5 A/SD, ICS MP5 A/SD, G&G KAC SR-25E2 0.8245 1.677 2 CYMA AK, CYMA MP5 A/SD, G&G UMP 0.8625 1.715 3 CA M249/MK46, A&K M249/MK46 0.8095 1.662 4 G&G GR-25 1.4505 2.303 5 A&K SR-25, JG SR-25, CYMA SR-25, ICS SIG 550/551/552 0.9635 1.816 6 KA FAL, TM MP5K, A&K M240 0.8945 1.747 7 PTS MASADA, CA SCAR-L 1.1345 1.987 8 VFC SCAR-H 1.5075 2.36 9 EF/S&T TAR-21 COMP 0.8765 1.729 10 EF ARX160 ELITE 1.4865 2.339 11 CA KAC LMG, VFC MP5 A/SD 0.7475 1.6 12 LCT AK-47/74/M 0.8355 1.688 13 A&K MASADA/ACR 1.3465 2.199 14 KA CZ 805 BREN, CG M249 FEATHERWEIGHT, A&K M60 1.3895 2.242 15 EF/ARES G36KV/CV, JG G36 1.0545 1.907 16 EF/S&T G36C 1.0415 1.894 17 CA AUG 1.0045 1.857 18 G&G MP5 A/SD 0.795 1.647 19 VFC/ECHO1 XCR 1.227 2.079 20 CA G36 1.026 1.8785 21 CYMA MP5K, CA SA58 0.923 1.771