Put Threaded Muzzle Brakes On Non-Threaded Barrels
Steel adapter allows you to install muzzle brakes and flash hiders
on tactical rifles with an unthreaded barrel. No machining
necessary; four setscrews secure adapter to barrel in seconds.
C-1 Adapter features 14mm-1.0 lefthand threads for
7.62x39 caliber AK-47 and SKS rifles. C-5 Adapter has
½-28 threads for installation on Colt sporter and similarly
contoured, AR-15 barrels.
AR-15, Issue:08, Page:016
Big Book Catalog, Issue:65, Page:016
New Product Supplement, Issue:571, Page:004
SPECS: Steel, blued finish. C-1 - 1-3/16" (3cm) long,
.552" (14mm) I.D., .830" (21mm) O.D. Fits AK-47 and SKS.
C-5 - 1-3/16" long, .708" (18mm) I.D., .978" (25mm) O.D.
Fits Colt AR-15.