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Anyone build an 80% P320?

This is a discussion on Anyone build an 80% P320? within the P250, P320, & P320 X-5 Pistols forums, part of the SIG Sauer Pistols category; Has anyone built an 80% P320? How did it work out? Can you compare it to a store bought one?...


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P250, P320, & P320 X-5 Pistols P250, P320, & P320 X-5 Pistols

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Old 05-30-2019, 02:41 PM   #1
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Anyone build an 80% P320?

Has anyone built an 80% P320? How did it work out? Can you compare it to a store bought one?
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Old 05-30-2019, 05:26 PM   #2
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Not quite sure what you mean by a 80% 320, but living in Mass I could only buy a compact 45. Then bought a full size slide, then a full size grip, and then i said what the hell bought fcu off gunbroker and now have 2 complete 320 45s. Both run great.
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Old 05-31-2019, 09:01 AM   #3
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I'm also puzzled but what you mean by a 80% P320.
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Old 05-31-2019, 09:04 AM   #4
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Old 05-31-2019, 09:44 AM   #5
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Originally Posted by Mort View Post
Not quite sure what you mean by a 80% 320, but living in Mass I could only buy a compact 45. Then bought a full size slide, then a full size grip, and then i said what the hell bought fcu off gunbroker and now have 2 complete 320 45s. Both run great.
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I'm also puzzled but what you mean by a 80% P320.
An 80% firearm is, by the ATF definition, not a firearm. So if you finish the last 20% no serial number is needed (at least in the free parts of America), and nobody has to know you have it. Plus it is kind of neat to build something.

OP, I’m curious myself, but every time I’m price it out, I decide it’s not really worth it. I say that, but I’ve been known to spend money dumber stuff, so...
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Old 05-31-2019, 09:51 AM   #6
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I know what an 80% lower is reference an AR.

I did not know there was an offering for an 80% P320 out there that you could buy and finish assembling yourself.

Frankly isnt the P320 pretty much 80% once you've bought the fire control unit? Everything else, slide/barrel/frame/springs is just parts.

Im not sure how they would go about selling an 80% FCU since that is by legal definition the "firearm".
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Old 05-31-2019, 10:16 AM   #7
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By definition, an 80% firearm can be no more than 80% complete.

With an AR-15, it is a lower receiver, that has not been milled out for the fire controls.

With a P320, it is a raw stamping of the FCU, with no holes drilled, or rails finished.

Some folks like to build them just because they can, and enjoy mechanical projects. Others because it is no ones business what you do or do not have, and no paperwork is necessary to build one.
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Old 05-31-2019, 10:30 AM   #8
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By definition, an 80% firearm can be no more than 80% complete.

With an AR-15, it is a lower receiver, that has not been milled out for the fire controls.

With a P320, it is a raw stamping of the FCU, with no holes drilled, or rails finished.

Some folks like to build them just because they can, and enjoy mechanical projects. Others because it is no ones business what you do or do not have, and no paperwork is necessary to build one.
Neat idea if you have the tools/shop to assemble it the rest of the way. I can see the appeal to that.

I just didnt know Sig offered a stamped out FCU like that.
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Old 05-31-2019, 10:32 AM   #9
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They don't. A few different companies make them, and also a jig to drill the holes and bend the rails in the correct places.
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Old 05-31-2019, 10:48 AM   #10
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They don't. A few different companies make them, and also a jig to drill the holes and bend the rails in the correct places.
Ohhh very interesting. I appreciate you sharing that wish us cause now Im actually wanting to look into it!
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Old 05-31-2019, 11:40 AM   #11
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There is no national registry for guns I'm aware of. Looks like building one costs more for the parts and jig than buying new. That by at least $150 to $250 from the examples I saw. I must of missed the point unless one is very paranoid, or they're willing to pay extra for the challenge and fun. I have enough to do already, some of which might be fun.
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Old 05-31-2019, 12:50 PM   #12
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I built one some time ago. I built it to shoot all calibers, so I trimmed down the ejector to match my .45 compact. Then I notched it to accept the manual safety. So now I have a M17. Decided I like the compact grip frame better than the M17 grip, so I cut a compact grip for the safety as well. When I put my full size 9mm slide on the .45 and shoot them side by side, I canít tell the difference.....except for the safety.

I



Sadly, I donít get to shoot it very often. I leave it at by brothers place since California decided to make registration of 80% firearms mandatory. Really took the fun out of building guns.....
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Old 05-21-2020, 01:04 PM   #13
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I'm in the process now but lack of lpk's has me at a stale-mate
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Old 05-21-2020, 02:01 PM   #14
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Quote:
Originally Posted by bumper View Post
There is no national registry for guns I'm aware of. Looks like building one costs more for the parts and jig than buying new. That by at least $150 to $250 from the examples I saw. I must of missed the point unless one is very paranoid, or they're willing to pay extra for the challenge and fun. I have enough to do already, some of which might be fun.
There is "No Official" registry. It has nothing to do with paranoia. I don't own any, but I think its great for those that want to.
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Old 05-21-2020, 02:32 PM   #15
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I went through this about a year ago. Even though I was capable of finishing the 80% FCU I decided to just buy a FCU for $230. It worked out to be the more cost effective way to go. Now if I wanted to build several 80% FCU's it might of been more cost effective. Also there is no real gun registration here in Florida. Good luck with it....
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