Kynshot RB5000L AR-15 300 Blackout Hydraulic Recoil Buffer - Stainless Steel

The Kynshot RB5000L is a hydraulic recoil buffer purpose-built for AR-15 platforms chambered in 300 Blackout that run a Mil-Spec carbine buffer tube. As a slightly lighter-weight variant of the proven RB5000, the "L" weighs just 4.0 oz, allowing the action to cycle marginally faster for cleaner reliability on soft-cycling, under-gassed setups common with 300 BLK loads.

The buffer body is machined from 17-4 stainless steel for excellent corrosion resistance and long service life, and is filled with Mil-Spec hydraulic fluid that absorbs rearward bolt carrier energy and slows the opening cycle. This damping action reduces felt recoil, helps tame carrier bounce, and supports reliable cycling on 300 Blackout rifles that may be soft-cycling due to suppressor use, an adjustable gas block tuned on the lighter side, or other under-gassed configurations.

Measuring 3.65" overall and compressing to 3.25", the RB5000L drops into a standard Mil-Spec carbine buffer tube without modification, making it a direct, drop-in upgrade for any AR-15 build struggling with reliability on 300 Blackout ammunition.