If Front Sight doesn't accept a ALS holster for their courses I wouldn't want there training. The ALS is perhaps the best combat holster ever conceived and ran buy Travis Haley, Jeff Gonzales, and many others. The banning of SERPA holsters in my opinion is kinda stupid, however I do understand the argument against it.
Also, I would rock a ALS over the 5.11 holster by far, Safariland's ALS is a way higher quality holster.
Hope this helps.
"let us not seek the Republican answer or the democratic answer, but the right answer. Let us not seek to fix the blame for the past. Let us accept our own responsibility for the future." - John F. Kennedy
".45GAP = .45 Gay Automatic Pistol."