I really wonder about quality differences between MPTs if there were different producers?
Here its Russian Vepr AK47 worked app 600 shot
Here it's romanian AK47 for US civil market failed after 200-300
Here cheap ar-15 melted down fastly
Here another AR-15 has the longest durability.
BTW for assault rifle sustainable rate of fire is 10-15 shot per minute!! If you fire more than 15 per minutes your high quality gun would be damaged at least barrel would be destroyed, you would lost velocity.
Thats why always platoons need LMG like RPK's or FN minimis.
Modern variant of RPK47 , is RPK 16 has critical fire app 300!
RPK74 had app 200 fire.
I wish They to produce LMG .