18" 450 Bushmaster Upper Assembly AR 15 Rifle Length Rail

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List Price: $489.99

Our Price: $279.99

Savings: $210.00

Availability:: Usually Ships in 24 to 72 Hours
Product Code: 18450CMU1X24RLMLR

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18" 450 Bushmaster Upper Assembly AR 15 Rifle Length Rail

*Milspec forged aluminum upper receiver with forward assist and dust cover assembly installed. Matte black hard coat anodized Mil 8625 Type 3 Class 2. One large single Feed Ramp for big bore cartridges. Forged from 7075 T6 aluminum. This receiver has been correctly modified around the ejection port to allow for clearance and proper ejection of the 450 Bushmaster cartridge.

*12" Rifle Length Narrow Profile Free Float Rail. Very comfortable and very light weight. Your choice of Keymod or M Lok slots. Slots run the entire length of our rail at the 3, 6, and 9 o'clock postions. Picatiny rail sections NOT included but are available for purchase on our website if needed. Rail sections easily attach to our rails for adding accessories like bipods, flash lights, grips, lasers, etc.

*18" 450 Bushmaster 4150 Hardened Chrome Moly Steel Barrel with 1x24 twist. Heavy Contour with 5/8x32 muzzle threads. Proper single feed ramp for 450 Bushmaster cartridge. Parkerized finish.

*.750 low profile gas block.

*Mid Length Gas Tube.

*Compact competition muzzle brake with crush washer.

*This upper assembly will fit all standard AR 15 lower receivers.

This item IS NOT A FIREARM!!! It is only "Firearm Parts", so no FFL is needed and it can be shipped directly to you. You are responsible for knowing your state or local laws. We will not ship this item to areas where it is not legal to own..

Average Rating:

5 of 5 Total Reviews: 17 Write a review »

0 of 0 people found the following review helpful:

Good quality & Excellent Power	August 22, 2019
Reviewer: Michael Smith from Norton Shores, MI United States

Awesome upper. Seems very accurate. I have had this for a few weeks now and it is extremely well constructed. However, it was very difficult to remove the muzzle brake. I had to heat the barrel with a torch and torque on it. Also, I am still experiencing cycle issues with this rifle. It fires fine, but won't strip the next round from mag 90% of the time. I contacted seller who suggested drilling the gas port out to 3/32. Still no luck, and the bolt does not kick all the way back on last round. It seems to lock back, just not all the way back. Anywho, its a very nice upper and I will probably try an adjustable gas block next.

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0 of 0 people found the following review helpful:

450 BM	May 10, 2019
Reviewer: JUSTIN K from montpelier, OH United States

I received a 450 bushmaster upper 3 days after I ordered it and it looks and shoots great. Thanks.

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0 of 0 people found the following review helpful:

Great!	April 12, 2019
Reviewer: Anonymous Person from New Mexico

Great quality for an amazing price. Hard to find for a comparable proce elsewhere.

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2 of 2 people found the following review helpful:

Much Better!	April 8, 2019
Reviewer: Steve R. from Alabama

This upper is so much better made than the POS I got from bear creek arsinel. I like the price of their stuff but the last two uppers I ordered from them both had major issues and terrible accuracy. AR15Part.com got my upper shipped super fast and it performs not only flawlessly but accurately too!!! Much better looking upper too. My new go-to parts place.

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0 of 0 people found the following review helpful:

450 upper	March 29, 2019
Reviewer: Rick Dunahue from Kenton , OH United States

Product was even better than expected. Clean build, cycled perfectly, very accurate. Will definitely purchase again with confidence.

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