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Old April 14, 2014, 11:23 AM   #12
Senior Member
Join Date: November 4, 2013
Location: Western slope of Colorado
Posts: 3,485
Yep. Delayed roller blowback. No gas system in the MP-5. No gas ports to clog up. No gas tube to clean. Id think cast is fine.

Remember that you get higher velocity outta the longer barrels in MP-5's then handguns. This results in a higher velocity. Make sure your cast lead is up tonthat or you will get a crap ton of leading in the barrel
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