elitematch AR-15 buffer tube M4M16 rear support core base connection spring 5 kit, Black2

Adjustable kit with precision rolled threads. Accept the strictest tolerance control to ensure safety. 6-position buffer tube kit, 2.6 level 3. Suitable for real fire caliber Length: 182 mm (7.2 inches) Material: high-quality aluminum alloy, durable black matte surface Quality: Made in China, our strict quality control specifications Pipe connection thread code: 1-3/16 inch UN16 Shockproof, waterproof and anti-fog