Very hot looking upper - R&D Precision PW9 Colt/Glock 9mm 5 inch Upper Receiver Kit

This is a very nice looking upper, but it won’t run on the endo magazines and they don’t tell you this! The owner Randy answered my emails but is turning bussiness over to his sons and there service is terrible! They offer an enhanced spring for suppressed but it doesn’t come with the gun and they wanted roughly 30.00 dollars to send one to me also your warranty is longer good if you use that spring! There service is poor and they don’t have this working 100% I will get this upper running but with no help from the R&D team! Would stay away from these unless you are mechanical enough to fix! Sorry that we live in USA and these companies don’t stand behind there products Buy someone else’s bufferless upper for less money that works!