I have a Oly flattop 11.5" upper with FA carrier and sten conversion mag block. So far I love it. It took about 5 mags before it broke in and now it runs like a raped ape! The mag that it came with runs 100%. I'm in the process of tweeking my bulk sten mags that I bought from Tapco. It's a blast to shoot. Quality is first rate!

I have both the 9mm and .45 ACP conversions.  The 9mm has run flawlessly with both the factory magazine and the Sten/SOCOM mag block combo.  I also bought a used .45 ACP conversion and managed to break the old-style ejector on that one.  Had it replaced with one of their new, beefier ejectors and haven't had a problem since.

Mine works excellent.  Shooting it again tonight.  The factory mags do not come with a loader.  There are no loaders in stock.  The magazines are all but impossible to load without a loader, but I used a drill press and a small rod to load them.  2 of 4 factory mags were so pitted inside they would not feed, with the follower hanging up in the mag tube.  

I went with the SOCOM mag block and CDNN investment $5 mags.  The mags are exceptional and well finished and have had zero feed  problems.  

At $65 a pop for factory mags, the SOCOM block is paid for after the second CDNN mag is purchased.  

So far, I have about 1000 rounds through mine.  I use 124gr plated reloads and there is very little fouling.  The rifle feeds CORBONS, hydrashoks, lead bullets, etc.  It is a keeper!!!

Having bought quite a few TAPCO mags, you get some excellent, some OK, and some cannot use mags from the specials.  If you guy reconditioned for mroe $$$, then I am sure they are better than the specials, but at a higher cost...  Your choice.

i also have an oly upper in 9mm. works great, and 5 buck mags from cdnn are the tits.
although i have had one problem while shooting an ipsc match.
i had a faliure to feed, pulled the mag and rolled the rifle to dump the loose round ,stuffed in a freash mag and threw the bolt, BAM , the rounds piggy backed and the bolt must have struck the primer and fired the round.alot of smoke and my right hand stung a bit.after checking the piece out all looked good,and the barrel was clear so i stuffed another mag in her and fired the rest of the match.when i inspected the rifle at home i found no damage and its been running fine.

i do get lucky once in a while

Curt Blazier is the salesman to deal with. He is professional. The other one is not so good, and I dont like him. The head gunsmith is difficult to get along with, hes not very personable.

I have over 5k thru mine without a hiccup.My friends did a group purchase a few months back and all are very happy with theirs.

My .40 S&W upper rocks.

Simply the most enjoyable gun I own.

Holy Mackrel!!!  Just got my Oly 9mm upper.  I took it to the range and literally drilled the orange dot off the target at 50ft with modest CCI Blazers.  Most of the rounds actually went through the 1/2 inch hole in the middle of the dot.

Fit and finish are perfect, and match 100% with my bushy lower.

It shoots very smooth, perfect performance out of the box. It has slightly more recoil than I anticipated, but it is still really controllable in rapid fire.  As much as any other 9mm carbine I've shot.

I ordered it through atlantic firearms.  They were excellent to deal with if anyone is looking for a place to get one.

This just became my most fun gun.  

Highly recommended.

-- Fargo007