Looking to start a AR15 pistol build

[jibbs]

I was looking to make this as easy as possible on myself and just buy a lower and an upper. I know that about the legality of lower registration so we don't need to go down that road.

This could translate into advise for another separate build I was going to do, but I was told and have read many times that a lower is a lower. I know billet and forged look better and I may go route for a higher end rifle I want to do later, but so far as complete ready to lowers, I was looking at this one:
http://www.spikestactical.com/new/z/pistol-556-lower-w-enhanced-kit-p-539.html

Seeing as there is a back-order on these guys I'm in no real hurry.

The upper, I was looking between 2 different 7.5" models

1. http://www.rainierarms.com/?page=shop/detail&product_id=1095
2. http://www.rainierarms.com/?page=shop/detail&product_id=2144

I am leaning toward #1 because of the components on it. Since its going to be a pistol with an RMR on it, I don't really see the need for the full quad-rail, but wouldn't mind having one either. I like the way #2 is configured and it is a piston system, so that grabbed my attention as I hear these guys run dirty. Both basically the same price.

If there is something out there that you guys think is better than what I am looking at than by all means let me know about it. What I have chosen pretty much reflects my price range. I am looking for opinions either way.

Thanks for taking the time to read my post.

 

[GLOOB]

I don't see the point of an AR pistol, but I like the PLR-16 because it doesn't have the buffer tube sticking out the back.

 

[jibbs]

In the great state of Michigan you are not allowed to own a SBR. I agree that a 7" AR15 isn't the best ballistic performer, but who says you cant own a fun gun? A pistol can be loaded in your car, while a rifle cannot. I dunno many pistols that can fit beta mags on them anyways?

Realistically this gun will cost me a bit more than a FiveSeven. Couple hundred dollars. I already own the dies for the 223, have mags in all sizes (5,10, and 30), and drums in all sizes (90 & 100). The real question would be why not? Its a versatile platform. This gun is taking a lower end high power rifle cartridge and turning it into a carbine type cartridge power wise (by definition a rifle cartridge in a short barrel configuration is a carbine).

If I could own a SBR it would be a 11", only because It would balance better. I would much rather have MI approve silencers before SBR/SBS any day of the week. But it looks like neither one of those things is going to happen anytime soon so why not enjoy a gun that is pleasing to my inner need for another useless gun that is fun/cheap gun to shoot.