How long is your index finger?
Thats really not an issue, what is an issue is that the uppers that we have here only work with Colt mags when mated with the US Sig lower.
You have to either make a small relief notch on all your mags or take your uppers and have a small amount of metal removed from where the mags hit, all common AR mags needs this relief notch except the Colt mags so its really not plug and play.
I just look on my Swiss Arms... the serial number is on the upper. sweet
So why we don't start the production of a Swiss Arms lower/Ar-15 mags.
Thats is a good progect for Alberta Tactical Rifle !
I think you should try a SIG 556 before giving out the 3 cheers to the idea.
Aside from the fact you could potentially have two rifles sharing the same mags, I don't get why people would want AR mags over Sig ones. The AR mag seating method is more prone to operator error and system failure compared to the Sigs.
Good AR mags are not in abundance any moreso than the Sig mags.
About the only AR mag I'd stack up against the Sig mags for reliability are the PMags, and while they shouldn't, they do command a price of around $50 a piece up here when you see them on the EE (and they aren't there very long at that price).
Last time I bought 5/30 round Sig mags, they were $65 each; not exactly double the price.




























