If reliability with any mag is your goal, 5.56 is the best bet.I did watch the Military Arms Channel video as well as the Small Arms Solutions video. They were both very informative, but that’s the extent of my knowledge. I’d like to add one to my collection simply because it’s a unique design. I’m open to getting a 5.56x45, 6.5 Grendel or 7.62x39. I’m more inclined to get an SBR, but would like to be sure they run as reliably as a full length rifle. Most importantly, I’d like to know what to avoid when buying one. I see on their website that there are different handguard lengths and hidden gas blocks. What are the advantages/disadvantages of a hidden versus exposed gas block? Other than that, I don’t know the questions to ask, but am eager to learn.
I use the D&H and RZE Unimags in my M16A1 and they run 100% with a 7.62x39 upper. So, I consider them to be 100% because a full auto Colt lower is the gold standard. However, I wouldn't assume they'd run 100% in a different platform, though I wouldn't blame the magazines if they didn't.With regards to 7.62x39, getting reliable AR-pattern mags is hit or miss.
Do they have websites?Navalbeaver and Gramps96Kz are authorized Robinson dealers.
The keymod should be the cheaper option. Not sure if it's a machining time or just the popularity tax but Mlok has been more expensive since they started offering them.Thanks for the explanation. I have a couple of more questions. Why is the key mod upper $100 more than the m-loc upper? I'm honestly not really familiar with either. How long does Robinson typically take to build a rifle?
You don't have a choice. Pretty sure they're all 1:10s from RA....even though the configurator is showing them as 1:7. Just checked my 16" x39 to be sure...it's 1/10. Pretty positive my 9" is also a 1:10.What 7.62x39 twist is better for the 9.5" barrel? My Swiss Arms 553R and Arsenal SLR-107CR both have 1/9.44" twists, but their barrels are 11.9" and 12.5" respectively. I want to be sure I get enough twist, but don't want to over do it.