Armaspec Stealth SRS-BB Recoil Spring Big Bore Gen 4 AR-15

The Armaspec Stealth SRS-BB Big Bore Gen 4 is a self-contained, multi-stage recoil spring assembly that serves as a drop-in replacement for the standard buffer and spring in an AR-15. It is built for large-caliber AR-15 platforms chambered in 450 Bushmaster, 458 SOCOM, and 50 Beowulf.

The unit is designed to keep the buffer mass under constant tension against the bolt carrier and to keep the buffer spring from rubbing against the inner wall of the buffer tube, which supports smoother, quieter operation. The second stage is intended to reduce felt recoil. The assembly weighs 5.7 ounces and is finished in black.

It fits AR-15 Gen 4 Big Bore carriers with a rear opening larger than 0.60 square inch. Carriers with a smaller rear opening will not function with this assembly.

• Platform: AR-15
• Model: Stealth SRS-BB Big Bore Gen 4
• Calibers: 450 Bushmaster, 458 SOCOM, 50 Beowulf
• Fits: Gen 4 Big Bore carriers with rear opening over 0.60 sq in
• Weight: 5.7 oz
• Color: Black
• Type: Multi-stage drop-in recoil spring and buffer