I got upper kit in a few nights ago and was looking at it tonight...  Its fricken Sweet!!!   I love it!!!!

Heres where the questions come in...  Nowhere does it say .300 Blk (not doubting it, just saying)...

If someone (and several have) ordered one in .300 Blk and one in 5.56, it'd be a pain to tell them apart as is... 

Q1. Other than looking down the barrel and guessing, is there a way too tell the caliber that I'm missing???? (I looked under the rail best I could, but I did not see anything)

Also, when creating an SBR, either the Upper or barrel needs the caliber engraved on it... The LT lowers have Multi-caliber... 
Q2. So, what are those of you that got the 12" going to do???

The caliber is stamped on the barrel just in front of the extension.

So under the rails not really visible without disassembly???  I'm looked in the holes and not seeing it....

Attached File


I took a picture of the markings. Not the greatest picture though.

AKA not good enough for the ATF.  That's bush league, LT.

Thats what I was afraid of...

Those of you that have these in 12" (SBR) length, what are you doing?

I know at least a few folks on here bought these...

The same thing that the majority of people do when they make an SBR.  Simply engrave Cal. 300 whenever they engrave the Name of the manufacturer and location.  Even with barrel manufacturers that engrave towards the end of the barrel, it is not always obvious under a rail.  In addition you no longer have to worry about making sure every barrel is conspicuously marked with the caliber whenever you swap uppers.