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ffhounddog
10-19-2015, 07:53 PM
What lower did you SBR and why?

I did 2 Spikes because one had fire/safe and one said semi/safe.

Now thinking of doing one more, either a Gen 1 Aero Precision, New PSA lower, or my Armalite. The Armalite was on my 3 gun rifle and the Aero was my first lower I put together. The Armalite drops Gen1/2 magpul mags better. Aero is a cleaner lower and what I used for my LWRCi M6A3 upper.

Out of my 3 what would you do?

johnson
10-20-2015, 12:30 AM
I SBR'd my first AR lower I ever bought which was a complete LMT Defender 2000. I didn't know anything about ARs and even less about how to put a lower together. I didn't care about markings and only knew that LMT was/is good to go.

Out of your three, I would go with the one that has given you the least trouble (I suspect none have) and wouldn't worry too much about older generation PMAGs not dropping free. I'd be more concerned with it working with standard aluminum GI mags.

CWE
10-20-2015, 08:14 AM
I am in the process of SBR'ing a lower right now. I went with a forged Mega lower.

scw2
10-20-2015, 11:10 AM
Now thinking of doing one more, either a Gen 1 Aero Precision, New PSA lower, or my Armalite.


Is there any reason you're going with the Gen 1 Aero Precision instead of Gen 2? At first glance they look fairly similar, and any differences on the Gen 2 either seem to be positive or neutral changes as compared to the Gen 1.

ffhounddog
10-20-2015, 11:29 AM
Its what I have.

Was planning on the Group buy lower but that looks null and void.

I have the old AERO PRECISION written on it, I wonder if thats pre gen1.

I do like my Troy from a Complete Gun I have. I just do not know if pulling apart a complete gun is worth it. My factory Troy Rifle does have 2600 rounds through it and the Armalite a lot more ,Granted it is going to be with me for life....my Armalite still says M15A4 on it and would look good on a 16 inch gun. Then I think does it really matter what lower I use as long as I like it.

ffhounddog
10-20-2015, 03:27 PM
Thanks Tom.

GNRPowdeR
10-20-2015, 04:11 PM
I've been looking at an SBR and using either the PSA lower or buying a ready-made Daniel Defense SBR. Thoughts on building vs ready-made?

LittleLebowski
10-21-2015, 10:17 PM
I've been looking at an SBR and using either the PSA lower or buying a ready-made Daniel Defense SBR. Thoughts on building vs ready-made?

Build all the way, much cheaper and just as good. Run, do not walk to a BCM lightweight 11.5" upper.

Sensei
10-21-2015, 10:18 PM
I'm waiting on stamps for the following stripped lowers that I built up myself: Aero Forged FDE, Mega Forged Gator, and a CMT UHP15 PDW. The latter is a VERY cool lower, BTW. All have been test fired with at least 250 rounds on various 16-18" uppers and run just fine.

I'm also waiting on stamps for the following factory built uppers: BMC blem and 2 different KAC SR-15 IWS. They also run fine.

Finally, I have 2 SCAR 16s uppers (the serialized portion of the SCAR) that should get approved any day now. One will get a factory 10" barrel and the other a factory 14.5" under a Kinetic Development Group M-Lok rail that it currently wears. Again, all flawless in terms of function.

Finally, if you are going to build out the lowers yourself, I highly suggest that you look at PSA's customizable LPK's. Take a hard look that the LPK's that come with a MOE grip and no trigger group. Then, buy an either the ALG ACT or the ALG QMS trigger. Those packages will give you a quality LPK with an excellent trigger for about $100.

Sensei
10-21-2015, 10:22 PM
Build all the way, much cheaper and just as good. Run, do not walk to a BCM lightweight 11.5" upper.


Yep. The BCM 11.5" is much preferred over the DD Mark 18 10.5" upper that BMC sells on their website. That DD upper has a way oversized gas port...I mean waaay oversized if you plan to suppress it with full power NATO spec ammo.

Luke
10-22-2015, 12:52 AM
I seen on BCM's website that the 11.5" uppers are labeled NFA? I though it didn't matter on uppers because the lower is the "gun"? Am I gonna need two stamps to buy a bcm upper and then a lower?

ReverendMeat
10-22-2015, 01:26 AM
Nope. You won't need a stamp for the upper.

wilco423
10-22-2015, 03:54 AM
Run, do not walk to a BCM lightweight 11.5" upper.

Have you run it suppressed much? Just wondering how well the ELW profile supports a can. I sometimes run a SF 212 can on a DD 10.3" LW barrel and see more zero change than with a standard profile barrel. Not that zero shift is unexpected, I'd just prefer to have it be minimal.

HCM
10-22-2015, 10:08 AM
I seen on BCM's website that the 11.5" uppers are labeled NFA? I though it didn't matter on uppers because the lower is the "gun"? Am I gonna need two stamps to buy a bcm upper and then a lower?

You dont need a stamp for the upper but it can only legally be placed on a pistol lower or an NFA registered SBR or full auto lower.

If you already own regular ARs, you may want to wait until you have a pistol or approved NFA lower to put it on before buying the upper to avoid "constructive possession" issues.

LittleLebowski
10-27-2015, 07:15 AM
Have you run it suppressed much? Just wondering how well the ELW profile supports a can. I sometimes run a SF 212 can on a DD 10.3" LW barrel and see more zero change than with a standard profile barrel. Not that zero shift is unexpected, I'd just prefer to have it be minimal.

Yes. EAG class this past weekend. I did not worry about zero shift as I plan on only shooting it suppressed. With a H buffer and Saker 556, the weapon was very soft shooting, accurate, and reliable with steel cased ammo.

rob_s
10-27-2015, 07:48 AM
What lower did you SBR and why?

I did 2 Spikes because one had fire/safe and one said semi/safe.

Now thinking of doing one more, either a Gen 1 Aero Precision, New PSA lower, or my Armalite. The Armalite was on my 3 gun rifle and the Aero was my first lower I put together. The Armalite drops Gen1/2 magpul mags better. Aero is a cleaner lower and what I used for my LWRCi M6A3 upper.

Out of my 3 what would you do?

I used to have different thoughts on this than I do now. It used to matter more what lower you used, but there were also fewer options.

I would be inclined to spend a little time on the project, and build the lower the way you think you're going to want it set up. I'd then go shoot the lower with the mags, ammo, etc. that you might want to use when it's an SBR, but with a 16" upper on it. I'd check for things like buffer wear/angle, mag wear/drop-free, FCG wear/rubbing, etc.

Or, if you have a lower that's known good and functional, I'd go with that. Barring any kind of overly bizarro logo that annoys you (like the Spikes for me) I wouldn't worry too much about who made it at that point.

ffhounddog
10-27-2015, 03:26 PM
True Rob. The AP is cleaner nicer and has not been run that hard compared to the Armalite. Its proven, and with good parts.

Lost River
10-28-2015, 09:53 PM
I have been contemplating doing an SBR on a lower.

Without a doubt, I will use a Colt, probably a 6920.

Sensei
10-30-2015, 11:36 AM
Yes. EAG class this past weekend. I did not worry about zero shift as I plan on only shooting it suppressed. With a H buffer and Saker 556, the weapon was very soft shooting, accurate, and reliable with steel cased ammo.

Are you running a standard bolt carrier? I ask because I have an 11.5" BMC upper that will soon get suppressed. I'm curious to hear if the Gemtech adjustable bolt carrier or the LMT enhanced carrier are worth the extra cash when using this particular upper.

As it stands now, the gun does not appear to be over gased. I'm torn between waiting to see how it runs suppressed versus jumping on a Gemtech that is for sale on DSG.

LittleLebowski
10-30-2015, 11:42 AM
Are you running a standard bolt carrier? I ask because I have an 11.5" BMC upper that will soon get suppressed. I'm curious to hear if the Gemtech adjustable bolt carrier or the LMT enhanced carrier are worth the extra cash.

BCM standard (full auto profile).

Save your money, stick with BCM.

Sensei
10-30-2015, 12:47 PM
BCM standard (full auto profile).

Save your money, stick with BCM.

Thank you. Your insights are appreciated.

LittleLebowski
11-01-2015, 04:31 PM
Thank you. Your insights are appreciated.

Happy to help, I need your advice as well so PM inbound soon :D