I believe that's the point of them...same with the Daniel Defense 32rd mags...to be able to "down-load" to 30Strike Industries AR-15 Magazine (32 Rounds)
Strike AR-15 Magazine (33 Rounds) - Smoke
The Strike AR-15 Magazine (33 Rounds) is a tough carbonate SI Polymer Extreme material .223 Remington/5.56 NATO AR-15/M4/M16 compatible magazine. The SI AR Mag gives you three (x3) extra rounds compared to the standard AR-15 magazine which keeps you in the fight or have additional fun at the...www.strikeindustries.com
Are these new this year? Has anyone bought these and tried them out?
Personally I'd just load 30rd up instead of 28 like I do in the 30rd magazines. A 32rd capacity would or should allow a very reliable 30rd capacity.