CMMG 300 upper build or buy complete rifle?

[Boot]

Would y’all recommend the Banshee/resolute/guard upper as part of a build or the complete rifle? Looking for combination competition and home defense/range fun. 

[MoRivera]

As someone who has recently built a CMMG Radial Delayed Blowback upper with a mil spec lower and CMMG 9 ARC mags, I can say that the most recent CMMG Mag conversions/inserts are very reliable.  So state willing, you can have 30-rd AR PMags the feed 9mm and still save quite a bit on a quality mil spec AR lower.  I switch that upper with a 5.56 upper with the same lower, even same buffer system.  So it's a nice modular thing to have.

 

But for competition, you have more options for extended capacity with Glock mags for example.  40- even 50-round single magazines, whereas with the AR Mags so far there's only 30.  So in that respect a dedicated rifle that takes Glock mags may be a better choice, but it will probably cost more because you really should use the CMMG lower for Glock mags.  Plus if you're shooting a match where you will have to change mags, it might be less bulky to have multiple Glock 9mm mags on your belt than AR ones. 

Edited March 16, 2020 by MoRivera