M16A1 Buttstock Parts Kit

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Part Number: 515897301

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Description
Customer Reviews

The M16A1 Buttstock Kit is used on the M16A1 rifle. It is made of high-quality polymer and steel.

Features:

Made of high-quality polymer and steel
Trap door frame
Rear Sling Swivel and Screw

Applications:

M16A1 rifles
AR-15 rifles
Other .223/5.56mm rifles

Specifications:

Material: Polymer, and Steel
Finish: Black
Weight: 5 ounces
Length: 3 inches
Width: 2 inches
Height: 0.5 inches

MADE IN TAIWAN

Warranty:

A 1 Year Limited Warranty covers this product against defects in materials and workmanship.

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Average Customer Ratings

5.0

Great Repro A1 Buttplate, Great Price, No Metal

Purchased this to replace the buttplate on a Colt export parts kit and the form, fit and function are great. It fits the original Colt buttstock and trap door no problem. Externally it looks like the original, just newer and shinier, probably a different polymer than the original, and maybe a smoother surface finish on the mold tooling? Been a long time since I saw an original buttplate in new or NOS condition so hard to compare. The only real difference is there is no over molded steel insert where the trap door plunger/latch engages the buttplate, so the buttplate might wear sooner if you open the trap door repeatedly, but I don’t see this as a problem. If I recall correctly, the original (Type “E”) buttplate design has a steel washer-like piece that was insert molded at the upper screw hole that I think was meant to reinforce the buttplate. I’m not sure if it extended to the latch interface as a single piece or if they were two separate inserts, but from what I’ve seen of broken buttplates I wonder if the metal insert might have contributed to the failures by concentrating stresses in the molded polymer to a smaller cross section. Anyway the key thing is DO NOT OVER TIGHTEN the screw to the receiver extension/buffer tube on any A1 buttplate and you will be fine. I reused the original mangled-slot 40-year old screw with the original receiver extension and tightened it just enough to keep the plate snug, then maybe a partial turn more. Don’t try to tighten it until it stops, you’ll just over compress the buttplate. This part is way better than the other repro style offered by another company that has its own built in door. I tried one of those and it’s a decent fit, but I wanted to reuse the original trap door. That one is cheaper but this one is better, and it’s better priced than the repro from Fulton and definitely cheaper than NOS or even a take-off original. Thanks AW IBOR!

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Reviewed by: (Verified Buyer) SC from FL on 9/16/2026

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M16A1 Buttstock Parts Kit

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