promag 42 rnd mags
On a whim I bought 2 of these and my son and a friend bought 1 ea. All four rifles have the same brand upper, but each has a diff brand lower. 2 worked just fine,2 needed a little rework of the m4 feed cuts. On the 2 that needed work, the bullet nose was hitting slightly low going into battery, not quite 1/16". With fmj, no problem. With soft point it would feed fine, but would shear off part of the lead nose. After smoothing the transition point from the m4 feed cuts to the bbl extension feed ramps all work great. Just shows to go ya that there are very small differences between lower manufacturers. Not a perfect mag, but not too bad.
some times you can put a USGI green follower in a "iffy" mag and get it to run. sometimes that don't work either.
nose diving rounds ain't a good sign for reliability and plastic mags that are a bit wobbly in the feed lips are prone to double-feed too.
m4 feed ramps are one of those things where if you NEED them --something is up with the mag-- my guess would be the location of the mag catch is too low on the mag--
mags vary too and the low dollar one have the most 'play" in where the critical stuff goes.
arrg--another "double fire" day---
Wasn't nose diving, rounds were sitting in the mag a little low. I put a magpul gen m2 moe no tilt follower in one, worked perfectly by the way, but same thing. So I think u r correct that the mag catch is not in the perfect position. But I did notice that the feed lips are thicker on the promag than the magpul. About the difference that the rounds are sitting too low. The thing is that on two guns they sit just right, on 2 they sit a smidge too low. Not low enough that it wont feed, but low enough that the lead round nose was getting damaged. Funny that the magpuls and gi mags work fine in all 4. Wadda u spect for a 12 dollar extra high cap wundermag from a company that is well known for having issues with their mags not working right!!! But for a Zombie killer "hey look at my cool toy" range mag its not a total waste. Wouldn't take it into a serious situation thou.
mtdew.. Not sure I like all the extended mags they come out with.. Oh their fun at the range and all.. But in a bad situation. In other words when you trying to make yourself one with God and Mother Earth. Extended mags can get in the way..
Weight. Now take this for what it is worth.. Chip McCormik mags for my .45s info sheet came with them..
Feeding problems. Now this is not a M4.
- Substandard ammunition.
- Cartridge O.A.L. to short..
- Bullet nose to blunt.
- Bullet compressed into cartridge, needs more crimp..
- Feed ramp angle needs modification..
- Feed ramp needs polishing..
- Slide is short stroking: recoil spring too strong for ammunition used.
They also have a foot note explaining what the magwell was designed for.. Like 8 rounds say in my .45 theoretically.
Well if I put a 75 round mag in my AK, yes they make them. Now weight becomes a factor pulling down on the mag. Every so slightly, but a possible bit of enough to cause problems.
Am I a gunsmith? Hell no.. But just some info for reading.. Feel free to express your thoughts?
i haven't tried the pro-mags other than some 1911s that well sucked.--lol
i have got a couple late thermelt 30s that won't feed 5.56 in anything. but they will do 5.45x39 somewhat if you change a bunch of stuff and don't load um all the way up.
troy ind mags are even thinner in the feed lips than the pmag and they work very well indeed.
i'll not be getting any more troy mags though since they went all anti-gun , socialist.democrat.
if you can find the 40rd C_products ASC/mag their excellent mags and run very reliably out of the box. they ain't expensive --like $16 a pop--
Posting same time. Think?? were saying same same.. :biggrin:
Yeah me thinks I don't want anymore long dong mags, theses are just for range fun.
Yeah Geez seems a hundred years ago when I was in the Service we had the 20 round colt mags.. 30s had not come out yet..
Originally Posted by mtdew
Just standard Military issue I guess they were.. We really did beat the hell out of them, but they worked..
Even on full auto, 20 rounds is a lot of rounds going down range.. I guess for the young fellers out in the more open environment like Afghanistan or in the open Middle East longer mags are good?
But in a heavy thick vegetation environment.. Do not even think we used slings, trying to remember? Not sure long mags would have been to any real benefit, getting snagged was not something productive to a long life..
But ah hell their fun at the range.. Chicks dig em on my shorty...
lot of folks that run those mall-ninja courses like the 40rd mags cause they are about the right length to "mono-pod" off of in the prone.
sometimes we would bump into UDT that were carrying 40rd mags. we never got any 40s though. not much fun to a 40rd mag without FA funny button though.
they are heavy when full and a bit clunky.
i got a few 40s --mostly to piss off the gun grabbers. real time SHTF i grabbing the mag-pull 30s--
hell if those 60rd surfires didn't cost so much i would try one of them-- 4th shoud get one for his bump-firing shortie--LOL!