SPR/MK-12 Barrels 18.1″: Douglas-SS


Length          18.1″
Caliber         .223/5.56
Gas Block    .750



Special Purpose Rifle Contour Barrel.
M4 Feed Ramps come standard. 1:7 or 1:8 twist

This barrel comes with M4 Feed Ramps, MID, Intermediate Length or Rifle gas system, 1/2-28 threaded muzzle, and the proper OPS, Inc. muzzle contour for OPS, Inc. collar.

Chamber type and Finish is your Choice.

Please Note, barrels are finished to your specs after you order them. Currently, we are at about 3-4 weeks turn around for SPR barrels. We do hit delays from time to time and it may take an additional week.

2.5 lbs

Additional information



Gas System Length

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Chamber Type



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Matched Bolt

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