Yes, BFI vs. L prefix. I had the carbine with L prefix for some time. I got a 20" rifle a few months later. Both are V-Match.
My Center Ind. and Sanchez USGI mags fit fine. I receiently got hold of some used FN. But they wouldn't fit.
I then got an Accuracy Speaks trigger for my carbine (L prefix). I had done the 15 min trigger job in my carbine a while back but was smooth to begin with. So I tried to put the trigger that was orininally in the carbine (L) into my rifle (BFI) but it was way too wide.
I called Bushmaster and talked to a customer service rep named Israel and also Matt. They told me they had got a second supplier because of a lot of new LEO business. They wouldn't tell me who the new supplier was.
I also spoke to Tom Tyler who is a marketing guy. I tried to get more info out of him but he said that I needed to send the rifle back to their QC/gunsmith named Jim to see if it was still in spec.
Well, I traded the rifle for a Springfield Armory 1911-A1 in the mean time.
PS. Hi Matt, Israel, Tom and Jim. I still love my carbine.
Nothing personal strictly business. I made them an offer on the 1911-A1 that they couldn't refuse.