MidwayUSA is proud to offer this AR-STONER™ Optics Ready Upper Receiver Assembly in 458 SOCOM at an exceptional price! This AR-STONER™ carbine length upper features a 458 SOCOM bolt carrier group, parkerized finish, low profile gas block, and a heavy profile barrel. The A3 upper will attach to virtually any standard AR-15 lower receiver and comes complete with charging handle, forward assist, ejection port cover, A2 flash hider, bolt and bolt carrier assembly. Supplied without a rear sight, this upper is a great platform for a red dot sight or iron sights (both sold separately).

This .458 SOCOM upper is compatible with Mil Spec 5.56 magazines, including the AR-STONER™ AR-15 5.56 family of magazines. Mil Spec magazine capacities, using 458 SOCOM ammunition, are as follows:

10 Round 5.56 Magazine = 3 rounds of .458 SOCOM

20 Round 5.56 Magazine = 7 rounds of .458 SOCOM

30 Round 5.56 Magazine = 10 rounds of .458 SOCOM

40 Round 5.56 Magazine = 13 rounds of .458 SOCOM

Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.

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