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Posted: 3/26/2012 8:47:17 AM EDT
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This is a very nice forend tube from Yankee Hill Machine. I love having rails where I need them and nowhere else. However, I ran into a couple of glitches during installation that might be worth sharing.
The first is that the rearmost screw for the long rail hit my gas tube while screwing the forend onto the barrel nut. This was OK for me because I wanted the long rail on the bottom instead of on top, so I just removed that screw until installation was done. However, if I had wanted the long rail on top, I would've had to grind the screw down or find a shorter one so that it didn't hit the gas tube. The second was that I had trouble getting the forend timed properly with the upper receiver. My fault for not following the instructions exactly. I got the front sight rail and the rear sight leveled and then tightened the lockring. Re-checked level and then gave the lockring one more crank while holding onto the receiver because it gave me a bit more leverage. Ooops. YHM's instructions tell you to hold onto the forend tube while tightening the lockring, but I didn't understand the importance until I tried sighting in the rifle. That last turn was just enough to throw the front sight out of time in relation to the rear sight. I had to remove the forend and start over. When it was time to tighten the lockring, I removed the upper receiver from the lower to remove any temptation to grab the receiver instead of the forend. One last comment: the YHM tool is designed specifically for their lockring. It works great for that. Also, it has three pegs for tightening the barrel nut and seems really beefy. The only potential downside is that there isn't a square hole for a torque wrench, but I used the "barrel extension torque tool" from Brownells which has a socket for a 1/2" torque wrench. Worked like a champ! |
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