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[TFA777]

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[Calico1404]

Stripped no restriction. Complete needs BB.

[JTizel]

First AR...noobie questions

If you purchase a complete lower, the vendor will ask for your FFL. The FFL will swap the mag release for the BB before releasing it to you. I would check with the vendor if they are willing to ship it to your preferred FFL and if your FFL is willing to do the install.

After tax, shipping cost, and charge to install BB - it might be the same and save you the work and wait time.

[Wiz-of-Awd]

I understand I have to install BB before I install the upper or the mag (otherwise AW)...although technically is there also a 'constructive' possession issue if I buy a complete lower, and take a while to install BB since I haven't before, but the upper arrives before BB is installed?

I don't "think" that CA has constructive possession constraints, but others whom are more knowledgeable will be along to confirm that.

Caveat to the above statement, is to make absolutely sure you "are" in possession of items that provide for a clear and legal path of intent and use.
Example of this on a federal level of (SBR) constructive possession: Do not have a short barreled upper without having a legal pistol lower.

A.W.D.

[iLWRC]

I think if you start adding the "features" is when you need to have the BB installed.

Pistol grip, FCG, collapsible stock, etc.

Better safe than sorry.

[NIKSD]

I think if you start adding the "features" is when you need to have the BB installed.

Pistol grip, FCG, collapsible stock, etc.

Better safe than sorry.

Wrong. Removable magazine= needs tool to be removed. The "bullet button" requires tool.

[LeadFarmer74]

Wrong. Removable magazine= needs tool to be removed. The "bullet button" requires tool.

Actually you are wrong. It needs a bullet button if it has a detachable magazine and certain features like FH, PG, collapsible stock, etc.

[NIKSD]

Actually you are wrong. It needs a bullet button if it has a detachable magazine and certain features like FH, PG, collapsible stock, etc.

Ops! I stand corrected. Detachable magazine with at least one evil feature/flash hider, adjustable stock, vertical grip, pistol grip.../ requires BB.
Sorry, going for more coffee, too early I guess.

[Wiz-of-Awd]

Actually you are wrong. It needs a bullet button if it has a detachable magazine and certain features like FH, PG, collapsible stock, etc.

Actually, you're both wrong until OP has a centerfire upper in his possession.
This lower assembly could very easily be a rimfire build.

A.W.D.

[LeadFarmer74]

Actually, you're both wrong until OP has a centerfire upper in his possession.
This lower assembly could very easily be a rimfire build.

A.W.D.

Since OP is wanting a BB I assume he isn't going to build it rim fire.

[kcheung2]

I suggest you shop around, other shops can sell you a complete lower for less.

[Watercadet]

Your math and numbers are sound. Either the LGS you are looking at to build your lower is using more expensive parts or they are increasing their margins/charging for assembly. For your first there is nothing wrong with going complete. After you get it and realize you can assemble a lower in less than 10 minutes, you'll want to buy stripped lowers and piece together the components you want. Happy shopping.