We are a small shop that specializes in limiting the capacity of magazines for use in restrictive states. We design and install blocks for most any mag or drum.
We are located in beautiful Tonto Basin Arizona.
Mfg Item #: UD10670
Ultradyne USA MERCURY Brake, 5.56MM/223REM, Fits AR-15s with 1/2X28 Threads, Black, 3.1 oz., 416 Stainless Steel, Includes Shrouded Timing Nut UD10670