[John Sabato]

Okay... let's eliminate the the first issue... the tightness...

take the upper assembly off. remove the sear bar and spring, and the reinstall the assembled toggle. It should be a SMOOTH fit and traverse the length of the upper receiver groove with no binding. If it binds at all, find it and eliminate it. How? a minute amount of the finest and softest valve grinding compound you can buy in the grooves and then lap it until the it IS smooth... The gun is worthless if it won't function. If you keep the compound in the grooves and don't get sloppy, it shouldn't affect the appearance much, if at all. Clean thoroughly and lubricate with breakfree.

Test fire... Work without jamming? Yes?
Next issue locking open on the last shot.

With the upper half and the magazine removed, remove the right grip and insert the magazine... does the follower button engage the holdopen with sufficient force to push it up? Yes? then try the same thing with the right grip reinstalled. Does it still come up as far as it did before? NO? create enough grip clearance for the follower button to do it's job... Yes? Next step.

If everything is clean and lubricated, then load one round into the magazine and fire it. Holdopen work? Yes, then no more problems... try it with a full mag.

No? Then either the ammo is too soft on recoil (change ammo- try Winchester 115 gr. ball ammo available at most Wal-marts for about $11.00 a box). Does it work now? then we are done. Still not working? probably an inadequate magazine spring. Change mags and try the whole series of test over again ...

let us know what happens.