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Posted: 5/14/2017 5:07:53 PM EDT
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Have all parts and tools for upper with FF hand guard over low pro GB.
Is this order correct? Pin gas tube to block Insert barrel into upper receiver Slide gas tube assembly on and set with set screw Tighten barrel nut and torque Install flash hider Install handguard Is this the proper order? |
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Here's the proper steps.
- Support upper with proper tools (receiver block, BEV block, etc) in bench vise. - Insert barrel into upper, slide on barrel nut, grease threads and then hand tighten barrel nut. - Using torque wrench, tighten and loosen to proper torque spec a few times. Do final torque and ensure cutouts in barrel nut align with gas tube hole in upper receiver (not necessary with some barrel nuts). - Install gas tube in block, then slide block onto barrel, align properly, and tighten set screws (preferably with some form of threadlocker). - Support barrel with proper tools (reaction rod, barrel blocks, etc) in bench vise and install muzzle device. - Slide handguard over barrel and properly secure it to the barrel nut. You're done. |
| Check your individual parts, though. I have one hand guard that has to be installed before the gas tube, because of the design of it. It has the groove under the rail for the gas tube, but threads onto the barrel nut to mount the handguard. To say that doing a low-pro, hidden block under one of those can be a challenge is a bit of an understatement. |
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Quoted:
If you're starting with a stripped upper, it's easier to install the dust cover first. I always do the dust cover and forward assist before I do the barrel. Every gun I have the barrel nut and/or handguard holds the dustcover pin in place too... |
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