The problem has worked itself out after about 100 rounds which lightened the spring tension alittle. I have never had any shooting problems with either one of them except that from the factory the vmac wants to eject the casing very sharply backwards and has hit the side of the bolt and scratched it. they both are solidly built with heavy blow back bolts and very strong recoil springs. the Master piece is slightly heavier it seems but that doesnt mean that the vmac 45 is light. not much aiming needed so great for instinct shooting practice. Description: THIS PISTOL HAS FAKE SUPRESSOR AND ONE 32 RD CLIP. 45 acp vector arms velocity vmac-45 45acp mac10 copy, not uzi, ingram new 3 inch ' barrel decatur, al 35603: new: : 950. As far as the way that they shoot, they both feel the same. other model 9mm luger ingram m10a1 mac 10 'stamped s' semi auto original military armament co cave creek, az 85331: new old stock: : 999.00. A very slight issue and certainly not one that should sway your decission. the rear take down pin for the upper receiver is a better fit than the vmac 45. The vmac 45 does have one issue that the master piece arms doesn't. Not saying that the master piece arms version is an inferior gun by any means, the build quality is just about identical. I am a certified gunsmith and have had alot of practice with both of these pistols, quite honestly I enjoy the Vmac 45 better. I happen to own one a vmac 45 and a Masterpiece arms mac 45,

Velocity mac 10 9mm