My buddy on here ASH556 at work tonight had his rifle and and noticed that when locking the bolt back there wasn't the extra give or space you have once the bolt is locked (play in charging handle were you can pull it back further). Since I had my rifle we pulled out the buffer and spring out of each rifle and compared them since mine had the normal extra room/play.
His spring is two inches longer and came in a LMT SOPMOD stock kit, I have never seen this and have had an LMT SOPMOD stock kit on one of my older rifles I sold. It so far hasn't affected anything but I did a search and the only thing I saw is that a carbine buffer spring should bee between 11 3/4" and 10 3/4".
I was wondering if this could affect anything down the road or if someone knows why LMT provides a longer buffer spring. My guess is because it was/is for the MK18 as it came with an H2 buffer as well and to help compensate for the short barrel on that variant.
Here is a picture showing the difference and for the record mine came out of a Daniel Defense M4 V5.
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