![]() ![]() If everything checks, replace your RB5000 buffer with the RB5000L KynSHOT Marksman Recoil Buffer to remove less energy from your recoil cycle. The KynSHOT RB5000L Hydraulic Recoil Buffer was designed for use in AR15 rifles and optimized for use with light loads, including subsonic ammunition and. AR15 RIFLES UPPER ASSEMBLIES 204 RUGER UPPERS 223 WYLDE UPPERS or subsonic and suppressed for close quarters engagements. ![]() Weapons with barrelsshorter than 14.5” will need some testing with H2 or H3buffer combinations to prove out which is most reliable.When shooting 300 Blackout with Subsonic ammunition theSuper 42 Spring may be too powerful and not allow the rifleto function properly. 223 carbine model bolt is not locking back after final round ejection, first check your gas system, then check your buffer spring. Two op rods and springs ride above the BCG for reliable quiet cycling. The H1 andBraided Wire Spring works well in 18” SPRs, 16” rifles withmid-length or carbine gas systems and some 14.5” rifles.Most 14.5” rifles would benefit from the H2 Buffer, which themilitary issues in their M4A1 rifles. 2 position short stroke gas system eliminates the need for a buffer tube and spring. 300 BLK guns a Sprinco reduced power (yellow spring) is recommended. ![]() This is how the M4Carbine is equipped in the military and it is Geissele’s beliefthat lighter-weight buffers were a cost savings solution toprevent supplying expensive tungsten weights. Here's more information from the install instructions from Geissele's site:COMPATIBILITY AND TUNINGThe Geissele Super 42 Spring and Buffer Combinationships in the standard H1 configuration. This is a very nice combination, but be aware of the limitations (another reviewer had issues with cycling). ![]()
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