Got my MSA Adapter last week, got it put on and tested it. Went to range with 120 rds of different 223s and it worked great with 30 rd pmags but would double feed when you get to the last 2 rounds of a 20 round pmags. WTF i said and so i took both apart to find what the difference was and the 20 rd doesn't have the same follower as the 30 rds. That didn't sit too well because I prefer the 20 rds more than the 30s just because. So i went to the local gun shop and got a Lancer 20 round. With the dummy rounds it wouldn't feed the 2nd to the last round, the lancers do not have anti-tilt either. Again WTF.
I bought a 3 pack of the magpul yellow gen 3 anti-tilt followers and dremeled it to fit the 20 rd pmags and now it works like a charm. Attached are pics of the followers before and after the dremel job. In addition the 20 rd pmags with and without the modified followers. Went back to the range with another 120 rds of ammo, three 20 rd pmags with dremeled followers, two 30 rd pmags without modification, one ten round aluminum mag which already had an anti-tilt follower and a surefire mag just to make sure the rifle could still use them. I loaded 3 to 5 rounds in each magazine, lined them up, fired and swapped out the magazines as quickly as i could. I did this 5 different times and not one single failure. I only paused to reload and/or swap out the mags.
40 rds of tula 223 fmj
20 rds of brown bear hp
20 rds of brown bear sp
20 rds of silver bear hp
20 rds pmc fmj
As for the adapter itself, it's definitely quality made and when on the rifle it doesn't budge at all. It locks in tight and unlocks just like a regular saiga magazine. I was able to use the surefire without any problems. My 10 round aluminum mag drops free but the pmags won't. I had to sand inside the magwell a little because the pmags were tight at first but now it comes out with just a little tug. I think it's because my saiga has dimples which presses the the sides of magwell in a little. I'm good with it for now and maybe i will sand it a little more to drop free later.
I don't think an adapter can design away the problem a saiga would have with magazines without anti-tilt followers. I checked my surefires and the follower definitely does not tilt. So for all you folks out there that gets one, make sure you have magazines with anti-tilt. I think now days most do. I was surprised the 20 rd pmags didn't because it seems most manufacturers are putting anti-tilts even in their 20s. Maybe it's because the 20 rd pmags are straight walled and they didn't think it would be needed.
I doubt i will ever take that adapter off. It's just too darn convenient and i now have the ultimate goto rifle, an ak that will shoot 223s and take AR mags. It took awhile to get my adapter but it's money that i think is well spent IMHO.