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Lowers for pistols are the same as rifle lowers. Making a lower for a pistol has to be built in a certain order. It has to be barreled as a pistol first. Easiest way is buy a stripped lower, build you short barreled upper, attach upper to lower, and you now have lower that can be a pistol or a rifle.
If put a 16"+ barrel on first, its now permanently a rifle lower and cannot be a pistol lower.
My 300 blackout pistol build ran me about $550 without a bcg and charging handle as I swap those from other AR's.
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Really interested in doing a pistol build, but, don't feel like dropping tons o cash on a pistol lower.
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Lowers for pistols are the same as rifle lowers. Making a lower for a pistol has to be built in a certain order. It has to be barreled as a pistol first. Easiest way is buy a stripped lower, build you short barreled upper, attach upper to lower, and you now have lower that can be a pistol or a rifle.
If put a 16"+ barrel on first, its now permanently a rifle lower and cannot be a pistol lower.
My 300 blackout pistol build ran me about $550 without a bcg and charging handle as I swap those from other AR's.
Err.....that's wrong.
You can put whatever length of barrel on it. That's not the problem.
See
ATF Ruling 2011-4. In a nutshell:
The short version:
The receiver must be sold as either "Other" (stripped), or "pistol", on the 4473. It cannot be sold as a rifle (with a buttstock attached, makes it a rifle, and must be transferred as such). A RECEIVER SOLD AS A RIFLE (either as a complete firearm or with an attached buttstock but otherwise bare) CAN NEVER BE CONVERTED TO A PISTOL. Not legally. Once sold as a rifle, always a rifle.
It cannot exist with parts that can only turn it into an NFA firearm (i.e. having the stripped receiver, a short upper...and a buttstock assembly, without having a longer 16" barreled upper; that constitutes an SBR as it can only ever be built into an NFA item with the available parts).
If you want to shoot your pistol as a rifle, you must first remove the short upper entirely, attach a long barrel upper, and only then can you attach the buttstock assembly. Shoot as a rifle. To revert it back to a pistol, you must first remove the buttstock assembly, and then you can swap the uppers. At no point ever can it have a buttstock on with a short upper.
Again - this can only be done on lowers that were sold as "other", or "pistol". If you bought a rifle, you cannot do this.
Yes, it's a tedious bunch of legal and technical BS. Just register your lower with the ATF as an SBR and avoid all the hassle.