TripleBravo
18 February 2014, 00:30
One of the new products at this year’s SHOT show that I was super excited to see was the Mega Arms “Megalithic” upper receiver. So when I got one in my hands a couple of weeks ago, I couldn’t wait to build it up. (Reality check: Sick kids and a busy work schedule delayed my fun.) The President’s Day holiday gave me just enough free time to get the job done.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-parts01-1500-B3_zps1cd050b7.jpg
The unique reversible leveling unit is the designed feature that really sets the Megalithic apart from previous products. The spring loaded level stows and deploys easily with a twist of the finger.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-level01-1500-B3_zps324e7b13.jpg
For this build I used one of the Rainier Arms 16 inch Select MEDCON barrels. It has a mid-length gas system and is made of blackened 416R stainless steel.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/RA-barrelmarking01-1500-B3_zps0bef9896.jpg
The barrel comes with a dimple for a gas block screw opposite of the gas port. It’s not possible to pin a gas block when using barrels with pistol, carbine, or mid-length gas systems in the Megalithic.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/RAbarrel-dimple01-1500-B3_zpsdc496449.jpg
Even though the gas block in this build will live within the protection of the Megalithic’s rails, I always like to make the gas block as secure as possible. So I drilled deeper dimples for both screws of the gas block.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/RAbarrel-dimpled02-1500-B3_zpsc630a060.jpg
With that accomplished, it was time to install the barrel and barrel nut. This must be done prior to installing the gas block. Tightening the nut was easily achieved using the provided barrel nut wrench and my Snap-On torque wrench.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-NutWrench01-1500-B3_zps16772a9d.jpg
The next step was to install the gas tube into the gas block. The gas system assembly was then installed on the upper.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Gasblock-tube01-1500-B3_zps5864696a.jpg
The gas block screws were installed through the port cut into the bottom rail of the Megalithic. There are two more ports for barrels with carbine and pistol length gas systems.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-gasblockslots01-1500-B3_zps6e0bf13c.jpg
With the barrel and gas system installed, it was simple to add a muzzle device, BCG, and charging handle to complete the Megalithic upper.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-build01-1500-B3_zps7e1377ed.jpg
It looks great mounted to my Mega Arms billet lower. Now I just need to select an optic.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-onbag01-1500-B3_zpsbc792309.jpg
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-parts01-1500-B3_zps1cd050b7.jpg
The unique reversible leveling unit is the designed feature that really sets the Megalithic apart from previous products. The spring loaded level stows and deploys easily with a twist of the finger.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-level01-1500-B3_zps324e7b13.jpg
For this build I used one of the Rainier Arms 16 inch Select MEDCON barrels. It has a mid-length gas system and is made of blackened 416R stainless steel.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/RA-barrelmarking01-1500-B3_zps0bef9896.jpg
The barrel comes with a dimple for a gas block screw opposite of the gas port. It’s not possible to pin a gas block when using barrels with pistol, carbine, or mid-length gas systems in the Megalithic.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/RAbarrel-dimple01-1500-B3_zpsdc496449.jpg
Even though the gas block in this build will live within the protection of the Megalithic’s rails, I always like to make the gas block as secure as possible. So I drilled deeper dimples for both screws of the gas block.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/RAbarrel-dimpled02-1500-B3_zpsc630a060.jpg
With that accomplished, it was time to install the barrel and barrel nut. This must be done prior to installing the gas block. Tightening the nut was easily achieved using the provided barrel nut wrench and my Snap-On torque wrench.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-NutWrench01-1500-B3_zps16772a9d.jpg
The next step was to install the gas tube into the gas block. The gas system assembly was then installed on the upper.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Gasblock-tube01-1500-B3_zps5864696a.jpg
The gas block screws were installed through the port cut into the bottom rail of the Megalithic. There are two more ports for barrels with carbine and pistol length gas systems.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-gasblockslots01-1500-B3_zps6e0bf13c.jpg
With the barrel and gas system installed, it was simple to add a muzzle device, BCG, and charging handle to complete the Megalithic upper.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-build01-1500-B3_zps7e1377ed.jpg
It looks great mounted to my Mega Arms billet lower. Now I just need to select an optic.
http://i718.photobucket.com/albums/ww189/wjt1169/Mega%20Arms/Megalithic-onbag01-1500-B3_zpsbc792309.jpg