Product tech details: Economical, high quality m4 barrel extension is machined to mil spec standards with integral feed ramps and predrilled locator pin hole for fast easy barrel installations. Machined from 8620 steel and head treated for additional surface hardness to resist erosion by hot combustion gases for years of reliable service. Great for custom barrel jobs and caliber conversions. Mfg whitworth tool inc. Specs 8620 steel in the white. .8125" 16unf thread. Barrel locator pin required not included. Ar 15 M4 Barrel Extension Steel Unfinished, high quality rifle barrel extension parts by Whitworth. MPN: BXM4. Shooting Supplies SKU: 100004728 10926.
 Indicative Price: USD 21.99
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