Which to Form 1

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eastlandb1

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Hello. I would like opinions on which rifle I should Form 1.
I have a CMMG lower and a DD v7 light complete. I have alway planned on sbr the CMMG. Now having second thoughts. If I use CMMG I will get a 11.5 upper. DD I will get MK-18. One concern is I have heard CMMG's threading on there barrels can be off. I have a SDN-6 coming. I would also get a 300aac short upper for either one day in future. I know once I form 1 I will probably have the rifle forever. Thank's for any help.
 
Once you do the Form 1, you are likely to keep the rifle forever. So do the SBR on whatever receiver you like better. I'd probably do the DD, since it has a better reputation for quality.

However, I doubt there's really any difference between a stripped CMMG lower and a stripped DD lower. They're both milspec lowers, right?

Your comments about what uppers you'd get and CMMG's threading don't make sense, honestly. If you registered the CMMG lower as an SBR, you could still buy the DD MK-18 upper and put it on it. You don't have to match brands between uppers and lowers. So whichever one you decide to register, just make sure you get a short upper that you're happy with.

I've got two registered lowers myself, and they both happened to end up being S&W lowers. (I didn't set out for that to happen--it was just what was available.) The uppers are ones I built myself with whatever parts were available. One uses a surplus M16 A2 upper and I don't even know the brand on the other flat-top upper. Point being: you should really be asking which lower you would rather keep forever, not what upper will go on it.

The only thing I'd say is since you've considered the MK-18 upper, and you have a DD lower already, that's probably the one to register. There's a lot more cachet in having a complete DD brand SBR than in a mutt SBR (or even a complete CMMG brand SBR). If that matters to you.

Aaron
 
Am I understanding correctly that these are both AR lowers? If so, the deciding factor would be shelf height. If one has a low shelf and the other a high, register the low shelf.

Beyond that, I truly believe the only difference in milspec forged aluminum cnc milled lowers is the animal on the side of them :)
 
If one has a low shelf and the other a high, register the low shelf.
Click to expand...

I'm curious: what's the reasoning here?

The only thing I can think of is that I'm pretty sure a registered DIAS (drop-in auto sear) requires a low shelf, which means that if you bought a DIAS to make your AR15 full auto, it'd have to be a low shelf lower.

Of course, when a DIAS is installed in an AR15, it becomes a machine gun and so barrel length isn't regulated. But if you had multiple hosts, then if they were all also registered SBRs, you could leave the short uppers on when you swapped around the DIAS.

Is that the logic or is there something else I'm missing?

Aaron
 
Another vote for DD. I've had bad luck with some of CMMG's other products and bad customer service experience. I've had 100% reliability with DD products.
 
Aaron Baker -

Substitute RDIAS for RLL and you've nailed it!

Yes, you are correct, putting a registered conversion part into a weapon makes that weapon a "host" and bbl length no longer matter (as long as the device is installed). It's just me personally, if I go through the trouble of SBR'n an AR, it will be one I can drop a LL in. Think about ALL the possibilities (as far as I will go) and it will start to make more sense :)
 
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