By the way Cade, thanks for your quick responses yesterday. I figured you would be watching these forums as well. Too bad my barrel manufacturer isn't as competent as you guys. Also too bad I had .380 stuck in my head for 9mm ever since they called me. If that wall thickness is untested by the barre...

Durh, yeah that's one way to botch the calculations, garbage-in, garbage-out. Starting over: I found this gem from AAC: http://www.advanced-armament.com/assets/images/pdf/manuals/ThreadGuideREV_01-040513.PDF Standard undercut for 1/2-28 in that document is 0.450" so 9mm is a 0.0475" wall t...

Yes, I certainly didn't want it threaded 13.5mm, but the P239 slide dictated the barrel's OD and that dictated the largest thread pattern. I didn't know this when ordering or I would have gone with 9mm. Here are the two outfits selling the barrels: http://www.barsto.com/category_main.cfm?ID=239&...

**Edit for more general question Has anyone successfully used a threaded barrel with a wall thickness of 0.032" at the thinnest point? Two friends of mine have the P239 in 357 Sig, and I convinced them to file Form 1s and purchase threaded .40 barrels from Bar-Sto. The barrels are working fine,...

A little more insight into that proposed rule change: http://blog.princelaw.com/2013/01/15/cl ... t-so-fast/

Good blog btw.

No criticism of Enfield, but asymmetric tolerances drive me nuts. I know the designer/draftsman wants to say "get as close to x without going over/under", but I think most machinists immediately calculate the "real" nominal and setup a symmetric tolerance. In the 1" tube ID ...

Those of you filing multiple in the same envelop, did you include just one check or a check for each application?

If you were using a trust, did you include just one copy of the trust or one per application?

Thanks.

Does anyone know if there is a limit (official or unofficial) to the number of Form 1s you can file at once? I plan on sending each application separately with its own envelope, check, trust copy, etc, but has anyone been denied due to filing, say, 12 Form 1s under the same trust at the same time? I...

Well, that is pretty specific. Sometimes I don't know why I lurk and search forums for so long before posting. I guess I think it's rude to ask questions that have already been answered a hundred times over, but you guys have changed my mind in just a few hours. I'll make my own LID after all. Thanks.

Yeah, I keep telling myself to just suck it up and do the research, but I'm busy these days and searching for a shortcut. I'm pretty proficient with turning and have access to some very nice equipment, but I don't know where to start with the spring. It has been a few years since physics class and H...

Correct me if I'm wrong, but I believe a Nielson device/LID/recoil booster by itself is not an NFA item. After all, Gemtech sells their multimount LID direct from their website. I'm interested in manufacturing a Form 1 .45 can for my Sig P220, but I don't want to get into engineering the required re...