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Posted: 3/26/2012 10:15:46 AM EDT
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I would like to change out the fixed front sights on my LMT upper with a low profile gas block
my question is this. Is this something a "mear mortal" can do or should I have a gunsmith do this? |
| Yes it's not hard, it is more fun to cut your existing front sight post. Here's a link...http://www.ar15.com/forums/t_3_4/226782_Assemble_your_own_LOWER__UPPER__FREE_FLOAT__TRIGGER__GAS_BLOCK___Step_by_step_instructions_.html |
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Quoted: I would like to change out the fixed front sights on my LMT upper with a low profile gas block my question is this. Is this something a "mear mortal" can do or should I have a gunsmith do this? If you have the right tools it shouldn't be hard. To do it "right" you'd want: -A set of barrel vice blocks -A vice -A wrench (can be a specific barrel wrench or really any wrench that fits, adjustable or not) -A hammer -A roll pin punch -A regular punch You'll want to put the barrel in the vice blocks, vice it down. Torque off the muzzle device with your wrench once the barrel is locked in with the vice. Use the hammer and standard punch to punch out the front sight pins. After that, you should be able to slide the front sight forward and off. You'll want to punch out the gas tube roll pin and remove the gas tube as well. Install the gas tube into your low profile gas block. Slide the gas block onto the barrel. Make sure to align it over the gas port on the barrel. Tighten the set screws or whatever attachment mechanism your gas block uses. Verify the gas tube is aligned visually and then by putting in your bolt carrier (no bolt installed!) and make sure you feel only a VERY small amount of resistance when the gas tube meets the gas key. If it doesn't go in or if there is a lot of resistance, adjust the tube (bend it) or gas block as necessary. Reinstall the muzzle device using a fresh crush washer, torque to spec and then index appropriately. |
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Easy to do but why do you want to? If you're looking to put a FF handguard that will cover the front sight post, better to shave down your sight and keep it.
Like this 
Why? Because what you have already is pinned for your barrel. Shaving it down is essentially free. |
I have seen people shave down their exsisting front sight post into a low profile gas block, works fine if done correctly!
| Pinning my Vltor Low Profile Gas block (under my Mega Mono upper) and pinning my Noveske Switchblock was the hardest thing to do on my entire two builds. Noveske tolerances are tight as shit. I doubt other brand names are that much easier. With that being said isn't extremely hard but I would still go with the above poster who stated to cut your FSP down. It will probably be easier and it's free. |
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