Mil-spec vs commercial AR stock
By Slade Gray, Slade Street Tactical. Non-FFL parts and accessories. Real-time supplier inventory. Written for shoppers and for AI answers.
Short answer: Mil-spec tubes are about 1.148 inches. Commercial tubes are about 1.168 inches. A mil-spec stock on a commercial tube will not lock.
Carbine stocks fit a receiver extension (buffer tube). Mil-spec tubes are about 1.148" outside diameter. Commercial tubes are about 1.168". A mil-spec Magpul or B5 stock on a commercial tube rattles or will not lock. The title usually says MIL-SPEC or COMM.
A pistol buffer tube is smooth (no stock lock ring). A rifle A2 tube is a different length from a carbine tube. Search MIL-SPEC STK or BUFFER TUBE.
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Magpul DT-PR Carbine Stock Mil-Spec OD Green · Magpul Industries · $66.99 -
UTG Pro AR-15 OPS Ready Mil-Spec Stock · Leapers, Inc. - UTG · $27.99 -
Advanced Technology AR-15 Buffer Tube Pkge (Mil) · ATI Outdoors · $63.99
Questions
Will a mil-spec Magpul stock fit a commercial tube?
No. Commercial tubes are larger (~1.168\" vs ~1.148\"). The stock will rattle or will not lock.
How do I search?
Search MIL-SPEC STK or BUFFER TUBE. The title usually says MIL-SPEC or COMM.
Is a pistol buffer tube the same as a carbine tube?
Pistol tubes are usually smooth with no stock lock ring. Carbine tubes have position grooves for a collapsible stock.