AR Pistol Build Information Please

[huntercf]

Do you need to register an 80% pistol lower or anything? Or do you build it without gas tube and use a sled mag.... THEN make it semi??

There is no requirement to register your 80% lower.

We have a lot of debate on this forum about whether it is lawful to later convert your single-shot 80% to semi-auto. I believe that it is not legal, and that Penal Code section 32000 is the reason why. You're manufacturing a "unsafe handgun" as that term is used in the code. There is no exemption in the code for personal manufacturers.

A lot of folks try to separate the semantics of "manufacturing" and "converting", but there's no support in the case law for that approach. It's really a wide open question just waiting for a defendant to serve as the "test case."

You do not need to register an 80% firearm, you may want to have it laser engraved with a S/N and you can always do a vol reg.

When you build the firearm from an 80% you must follow certain steps to comply with the law.
1. After you have completed the drilling/milling of fcg and installed lpk you must install a bullet button so any magazine becomes fixed.
2. After step 1 install a zero round sled.
3. Install upper
4. Once you have completed the above steps you may remove the 0 round sled.
If you attach the upper without a fixed zero round sled you have manufactured what CA considers an unsafe weapon which is against the law.

[Alpineshooter]

Thanks for the information.
Is there a minuim length or maxinium length?
Bullet button and less than 10 rounds?

I have a 7.5" 5.56 that is extremely accurate on a 12" steel plate at 100 yrds.

[lone shooter]

You do not need to register an 80% firearm, you may want to have it laser engraved with a S/N and you can always do a vol reg.

When you build the firearm from an 80% you must follow certain steps to comply with the law.
1. After you have completed the drilling/milling of fcg and installed lpk you must install a bullet button so any magazine becomes fixed.
2. After step 1 install a zero round sled.
3. Install upper
4. Once you have completed the above steps you may remove the 0 round sled.
If you attach the upper without a fixed zero round sled you have manufactured what CA considers an unsafe weapon which is against the law.

Anybody have a source for a zero round sled? I think Franklin Armory has one but haven't found any other vendors.

[LeadFarmer74]

This is what I use.

http://www.midwayusa.com/product/2327196189/original-bob-sled-loading-block-ar-15

[lone shooter]

^ thanks.

[PseudoTsuga]

I went with a much cheaper vice block that goes into the magwell for working on a lower. They're on amazon. Same concept, but they don't lock the action back as they aren't intended for firing. However, the action will reciprocate (so it would be a self-extracting, straight-pull, single-shot bolt action).

[PseudoTsuga]

$15.90

http://www.amazon.com/ProMag-AR-15-Lower-Receiver-Magazine/dp/B002E6P3IM

The Bob sled is way nicer though.

[ronstafari]

Is there any official way to document that the AR pistol was assembled as a single shot, and then converted later on? Is the only way to register it?

[Lightstrider]

receipts with sled, maybe build upper so you can order gas tube separate to show with a pic of it single shot....

[huntercf]

Anybody have a source for a zero round sled? I think Franklin Armory has one but haven't found any other vendors.

You might try amazon as well.

[lone shooter]

^ Google only returned the Franklin Armory one (which I like and is cheaper) and the Original Bob Sled one for way more.

[spyde12]

I shoot 5.56. This is just my experience with a no so name brand barrel. 10.5 would be good I'm sure but 7.5 just put more wear and tear on the bcg and gas tube. How much more for the average shooter? It could be negligible. I've added a picture with a test of pressure on different barrel lengths and gas systems. As you can see the shorter versions run much higher pressures than their longer counterparts.

I went the piston route because I wanted a 7.5 barrel and heard about the additional wear on the gas port due to the shorter barrel. Runs smooth and clean after the same amount of rounds.

Sent from my SM-N900T using Tapatalk

[lone shooter]

I went the piston route because I wanted a 7.5 barrel and heard about the additional wear on the gas port due to the shorter barrel. Runs smooth and clean after the same amount of rounds.

Sent from my SM-N900T using Tapatalk

So I'm looking to build a 9mm AR pistol with a 7.5 inch barreled upper and customer service from the vendor said it employed blowback method vs. gas tube. Anything I should be concerned about?

[RickD427]

So I'm looking to build a 9mm AR pistol with a 7.5 inch barreled upper and customer service from the vendor said it employed blowback method vs. gas tube. Anything I should be concerned about?

Yes, How do you plan to satisfy the "Break-Top" or "Bolt Action" design requirement?

[spyde12]

So I'm looking to build a 9mm AR pistol with a 7.5 inch barreled upper and customer service from the vendor said it employed blowback method vs. gas tube. Anything I should be concerned about?

Well pistons don't use a gas tube. The only difference I see is that the gas is pushed in front vs the action. Plus less filth.

Sent from my SM-N900T using Tapatalk