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I was going to post the same thing haha
But im in a good mood this morning, so here you go OP
1)AR15 lowers do not have the pin hole drilled above the safety necessary to install the sear. The 3 round burst trigger, just like the full auto trigger needs to use a sear.
2)Not all but MOST big name AR15 manufacturers produce their lowers with a “High Shelf” which basically means they leave material in the lower so you cant easily install a sear. This makes it difficult for the avg joe to “Accidently” convert his rifle to full auto. It would take professional tools and knowledge plus hours of drilling, milling and prepping the lower before it was ready to be converted. Even then the slightest miscalculation can make it not function or be potentially dangerous if the timing of the sear is off. Im assuming this is something big gun companies due to cover their butts for legal reasons.
3)Also the 3 round and full auto triggers use different safeties and different trigger assemblies, but dimensionally they are the same.
If youre curious how they work mechanically, there are youtube videos that show how it functions. I doubt you would be stupid enough to come on here asking how to illegal convert a semi-auto to full auto but just incase, DON’T DO IT! Seriously.
If you want full auto save some cash and buy a transferable, they are expensive but boat loads of fun, way more fun than any boat ive ever been in!
But theyre also the reason why I cant afford a boat, as feeding a MG is quite costly.