Tapp M870 M4 Competition Adapter

Price: $29.99 – $139.99 — In stock at 1 retailer.

Prices last checked August 19, 2026 across 2 retailers.

M870 M4 Competition Adapter The TAPP M870 M4 Competition Adapter upgrades your robust 3-shot M870 with M4 AEG magazine compatibility and a flared magwell for faster, smoother reloads—now 3D printed in Nylon PA12 with the option of upgrading to PA11 Carbon Fiber for superior strength, durability, and long-term performance. Designed and built in the USA, this plug-and-play adapter integrates seamlessly with the M870 and most tri-shot platforms to boost your competitive edge. Key Features: - M4 Magazine Compatibility: Run standard M4 AEG magazines for increased capacity and quicker reloads—optimized by the flared magwell design. - Flared Magwell: Enlarged, competition-focused funnel for rapid, confident mag changes under pressure. - One-Piece Adapter Design: Engineered for smooth, reliable BB feeding and consistent performance. - Nylon PA12 with the option of upgrading to PA11 Carbon Fiber Construction: 3D printed carbon fiber–reinforced PA11 delivers higher rigidity, impact resistance, heat stability, and longevity—lightweight without sacrificing strength or precision. - Versatile Fit: Compatible with the M870 and almost any tri-shot shotgun for broad platform flexibility. What’s Included: - Fully Assembled Adapter: Ready to use out of the box—no modifications to your existing magazines required. Proudly made in the USA. Backed by a 30-day warranty and lifetime technical support, with access to replacement parts (fees may apply). Compatibility: M870 and almost any tri-shot shotgun

Tapp M870 M4 Competition Adapter price comparison: the lowest price is $29.99 at Tapp Airsoft, the highest is $139.99, and the median across 2 tracked listings is $84.99. Comparing retailers can save up to 79% ($110.00) versus the highest-priced listing.

Compatible with: M4/AR, M870, Shotgun, HPA, AEG

See all M870 magazines & fitment →