A few days ago I was putting together my 723 clone and when I went to torque the barrel I realized that my upper receiver block was nowhere to be found.

Long story short, I looked for it for two days with no luck and its the only thing stopping me from shooting it.

I was wondering if anyone had one that I could borrow? I would be more than happy to pay for shipping both ways.

I just hate to buy another one knowing that I'll find the other one sooner or later.

I really do hate to ask but I would really appreciate it.

Have you ever used a giessele reaction rod? They rock. There $$ but worth it.

I haven't. I've heard good things about them though.

I'm in the same boat. I loaned mine out and he swears he brought it back. So apparently it's here somewhere, but I gave up after looking for over an hour.

I'll mail mine out to you on Monday.

Thanks, IM inbound.

If that fails, I have old school barrel blocs for a vise that I can lend you...

For note, when I've been caught in a bind, I cut a 2x4 the length on the top and the bottom between the two lugs. To hold the angle on the carry handle you can get a pack of door shims at home depot.

Watch the torque on the ejection port door area to not crack it.

Your vise has to be large enough to hold the upper sideways.