In stock, ships right away
M16 / M4 Gearbox Steel PinsOnly 2 left in stock
RetroArms Center Pin with Screws for M4 / AR15 and SR-25 Receiver CNC center pin is designed for the lower receiver of AR15-platform airsoft guns. The design with screws on both sides keeps the pin securely in place and eliminates the risk of losing it. Precision CNC machining and the steel construction make it a suitable replacement during servicing or receiver modifications. The pin is used to center and secure the gearbox in the lower half of the receiver. Key Features Ste...
This product is not on our own shelf but in stock at our supplier. We order it right after your payment; you receive it within 5–10 working days.
Temporarily sold out
Leave your e-mail address and we mail you once when this product is back in stock.
We will e-mail you as soon as the product is back in stock.
Shipped with GLS as soon as the product arrives from our supplier (5–10 working days).
14-day right of withdrawal and 60-day returns; start a return from your order.
RetroArms Center Pin with Screws for M4 / AR15 and SR-25 Receiver
CNC center pin is designed for the lower receiver of AR15-platform airsoft guns. The design with screws on both sides keeps the pin securely in place and eliminates the risk of losing it. Precision CNC machining and the steel construction make it a suitable replacement during servicing or receiver modifications. The pin is used to center and secure the gearbox in the lower half of the receiver.
Key Features
Steel Construction
The pin is made of 1.1191 steel, providing the necessary strength for the stressed connection of the receiver.
CNC Turning
The pin is manufactured using precision CNC turning for accurate dimensions and a precise fit.
Screws on Both Sides
The pin features threads and screws on both sides, preventing it from coming loose and getting lost during gameplay.
Hardened Surface
The pin and screws are surface hardened, increasing their resistance during use.
Blackened Finish
The components feature a chemically blackened finish that protects the surface and matches the appearance of standard black receiver components.
Compatibility and Installation
The pin is designed for the lower receivers of AR15 airsoft guns. According to the manufacturer, it can be installed in any M4 / AR15 receiver, including SR-25 models, that complies with the TM external parts standard.
Technical Specifications
Type: Center pin with screws
Material: 1.1191 steel
Manufacturing: CNC turning
Surface Finish: Surface hardening, chemical blackening
Compatibility: M4 / AR15 and SR-25 airsoft receivers
Package Contents
1× CNC M4 / AR15 center pin
2× retaining screws
In stock, ships right away
M16 / M4 Gearbox Steel PinsOnly 2 left in stock
In stock, ships right away
M-LOK T-Nut Replacement SetOnly 2 left in stock
In stock, ships right away
Ladder Rail Cover 18 Slots — Dark EarthOnly 2 left in stock
In stock, ships right away
Ladder Rail Cover 18 Slots — BlackOnly 3 left in stock
Airsoft Bazaar B.V. · Frankrijkstraat 4, 5171 PR Kaatsheuvel · Chamber of Commerce (KvK) no. 99363534
© Airsoft Bazaar - All Rights Reserved 2026