10-13-2011, 09:21 PM
LRRPF52 Wrote:when they try to insert the Surefire 60rd mag in the unique HK mag well, which is not compatible with PMAGs, and then see what happens. We had to force one into a 416 the other day, just to see if it fit. It wouldn't drop free either, and had to be pried out with force.
Not to defend the IAR, but the PMAG is out of spec. The HK was built per the documented STANAG (NATO) spec for the AR mags. And it works flawlessly with proper spec mags.
The problem is Magpul made the PMAG a bit oversized (over spec) to tighten the feel in the AR. Which is also what HK did with the 416, but for spec mags. Which then creates problems in rifles which are on the snugger end of the mag well spec. It's not only the HK that PMAGS are tight in, there are other AR's which have the same issue. (Typically billet receivers which work just fine with spec mags)
End result either way is a problem, but the HK development predated the pmag, and specifically it's usage in major military forces.
I don't have specific details, but I've seen references to various active duty units banning use of pmags due to the snugness factor totally independent of the 416/IAR.