What is the SKU for the rail you purchased (and where'd you buy it)?Originally Posted by Lallop
At one point Troy was making separate 308 handguards for both HP and LP DPMS uppers. I know this as I considered purchasing one for an M&P-10 (which has a low profile upper) but ended up buying an Odin Works rail instead. Troy only lists a few 308 LP rails on their website (most are specifically HP), and it looks like the LP rails they do have are all on clearance, so it may be a discontinued product.
The difference in height between HP and LP uppers is only about 1.5mm (1/16"), so maybe not as much as you might think. Here's a link to a PDF on Troy's website from when they were listing both types of rail:
https://www.troyind.com/sites/troyin...RS_COMPARE.pdf
As for installation, you were correct in the other thread when you stated that you should have used shims to help index the barrel nut instead of griding off some of the teeth when you couldn't get it to align properly (not something I would ever consider doing). Lapping the receiver face would be another option if you wanted to avoid shims, and/or be able to install the barrel nut at a lower torque setting.
If the cap head mounting screws are really too long and are digging into the barrel when everything is tight, the easiest solution would be to shorten them. You could mock everything up (rail assembled off of gun) and measure the difference between the OD of the barrel and the clearance between the screws when everything is tight, then remove the necessary length from the screws using a flat metal file, as it's likely not much.
Alternatively, you could give Troy a chance to address the issue. Funny, in the other thread you said you knew forum rules specify that you should contact the manufacturer first before posting a "buyer beware, Company-X is scamming people" type of complaint, but had decided to post exactly that anyways. That might be why many decided to just ignore the thread to begin with.
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