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KNS Precision, Inc. Stock Adapter
California Proposition 65 Warning

This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.

KNS Precision, Inc.

Stock Adapter

$60.00
$51.00
Sale Price
Available California compliant

KNS Precision, Inc. Stock Adapter with Flange, Fits AR-15, Converts Buffer Tube to 1913 Rail, Matte Finish, Black AR-MCX Adapter with Flange

Key Details
Brand KNS Precision, Inc.
Manufacturer Part Number AR-MCX Adapter with Flange
UPC 853906008492
SKU KNSARMCXADPWITHFLANGE
Current Stock 20 available
Quantity Updated Apr 26, 2026 8:15 PM
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Purchase Requirements
  • Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description

The AR/MCX Stock Adapter allows the user to mount a picatinny-style stock attachment (such as the SIG MPX folding stock or brace) in place of an AR15 style buffer tube. Many firearms utilize the buffer tube attachment of the AR15 in order to mount common stocks & braces, but do not mechanically require the tube for an in-line buffer spring. For these weapons, this product offers a modular alternative for attaching stocks or other accessories. The kit is composed of two parts and an attaching bolt. The externally-threaded adapter plug fits into the threaded buffer socket or ring. The adapter rail section firs into the slot in the adapter plug and the two are secured to each other and the firearm by a hex-socket bolt and lock washer. This product will not work with a standard AR 15 lower and the MCX upper and is intended only for applications where the carrier and buffer tube do not protrude past the receiver ring.

Features
  • Standard configuration AR15 style rifles will not function using this product
  • Incorporates a flange in the base of the picatinny plate
  • Allows the use of a standard takedown pin, detent, and spring on traditional AR15 lower receivers
  • This product will not work with a standard AR 15 lower and the MCX upper
  • Intended only for applications where the carrier and buffer tube do not protrude past the receiver ring
Specifications
UPC: 853906008492
Manufacturer: KNS Precision, Inc.
Manufacturer Part #: AR-MCX Adapter with Flange
Model: Stock Adapter
Type: Adaptor