Break in takes alot of oil in the gun and about 500 rds in a sitting. a good cleaning and relubing and u r good to go. It seasons your gun like a old iron skliet. The 512 does not come with the magnifier and isnt compatiable with night vision. But It does what i want it it to.. I wanted a CQB carbine. I have a patrol rifle so my 6721 is set up diffrently. The 6721 is the same as a 6920 le but with a heavy barrel.
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