It's not feed and function issues that you use a fixed-barrel spacer, it's to protect the barrel threads. That reciprocating action from the Nielsen device can eventually wear/strip them away. You can get a fixed-barrel spacer from Silencer Shop for $70.
I have a Mossberg 930 Tactical/Home Defense and the barrels should have been interchangeable according to the manual. I'm confused myself. The difference in barrels is between the 930 and 935, again, according to the manual. Also, your SPX came from the factory with the breacher barrel? It...
Great, now if only we could get the evangelicals to stop blocking stem-cell research so that science can one day save my life by growing me a native kidney when my transplanted kidney fails.
I'll chime in that I've ordered from them a half dozen times both before and after the panic and the only complaints I have are the excessive lead times post-panic and that they stopped bothering to pack the ammo carefully in their rush to get orders out the door. I've had boxes just busted up...
Don't waste money on cheap optics. I have a Vortex Sparc sitting in its box right now gathering dust. It used to be on my H&K UMP conversion (semi-auto SBR) but I got frustrated trying to see through that narrow field of view and very green glass. I now shoot it with just the stock irons. An...
Speaking of multiple calibers and multiple lengths for your Form 1, DO NOT do this. As of Jan 2013, the ATF will kick back your application and make you correct it by hand and resubmit. Just put one caliber and one length of the potential SBR's original configuration.
I second the H&K suggestion. I have a USP 9mm fullsize and the grip is rather large. Of course, I still use a Hogue Handall just to round out that blocky grip...