hk53a3 Posted May 22, 2018 Report Share Posted May 22, 2018 (edited) Build from an MP5 40 parts kit with a Michael's Machine 10mm barrel buy Investment Grade Firearms. I ran about 100 rounds through it, ran 100% with my MP5 40 internal parts and correct locking piece for 10mm, (included with upper correct 10 high and low locking pieces), bolt hold open functions correctly. $1900.00 plus actual shipping. Edited May 23, 2018 by hk53a3 typo Link to comment Share on other sites More sharing options...
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