I had a customer who liked the way that Oly Arms does their 9mm uppers with the ability to use the inexpensive Sten mags and the 50 rd Lanchester mags, but he liked the looks of the Colt 9mm. So what I did was to take a Colt upper receiver, and I have a really good gunsmith who is able to put in the little spring loaded ejector that Oly Arms uses. I then got the Colt gas deflector and 2/3's ejection port cover and put them on the upper receiver, so you have an upper receiver that is basically a Colt SMG upper receiver. I then put on a 10.5 inch Oly Arms barrel and an Oly Arms full auto bolt and carrier. This unit was test fired only, and it functioned flawlessly. Then my customer lost his job, so I am selling this upper reciever with one Oly Arms modified Sten mag. I guarantee all the uppers I do. If you are not 100% satisfied, send it back for a complete refund. The upper and mag are $575 + S&I. All NFA rules apply. Unit can only be used with a full auto registered lower receiver.
Alamo Professional Arms