The Heckler & Koch Buffer Retainer (H&K part no. 50233120) is a genuine factory part for the HK416/MR platform, built for the MR556A1. The retainer holds the buffer captive in the receiver extension under spring pressure, so a worn or broken retainer can let the buffer walk out during disassembly or fail to hold it seated in the receiver.

Key Specifications

• built for the HK416/MR platform specifically fitted to the MR556A1.
• retains the buffer under spring pressure keeping it properly seated in the receiver extension.
• factory H&K replacement part matching original fit and function rather than an aftermarket substitute.

Frequently Asked Questions

What rifle platform is this for? It is a factory-correct buffer retainer for the HK416/MR platform, fitted to the MR556A1.

What does a buffer retainer do? It holds the buffer captive in the receiver extension against spring pressure so it stays properly seated.

Buy the HK416/MR Buffer Retainer

Keep the buffer properly seated with the current factory H&K retainer instead of a worn original. Browse more of our rifle parts selection and order from our Lubbock, Texas gun shop.