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Yes, the .450 Bushmaster AR uppers were designed with the standard AR-15 lower receiver in mind, so it should work with the standard spring and buffer.
The Great Lakes firearms and ammunition.450 bushmaster upper is very good quality for the price. Shoots very nice with very little recoil. The upper fit nicely on multiple lowers I have. The muzzle break does a good job or recoil management.
Bought this and put it on my Anderson Lower. Didn't make any changes and it shot well. I've only run about 15 rounds through it to sight it in. I have a red dot on it and it's shoots better than I can off hand.
Product Info for GLFA AR-15 Complete Upper .450 Bushmaster 18in, NP3
Leading the way in top-notch precision shooting the GLFA AR-15 .450 Bushmaster Complete Upper will take your modification to the next level. These AR15 Upper Receivers from the trendsetters at GLFA feature an A3 flattop upper receiver that provides M4 feed ramps for better control when shooting. Thanks to premium quality materials like the 18in chrome moly barrel the GLFA AR-15 18in Complete Upper Receiver is precision machined to be the very best. Get a longer life out of your upper receiver and the highest in quality with superb parts. Eradicate hogs, boars, and other varmints with the top-of-the-line GLFA AR-15 NP3 Complete Upper Assembly.
Features of GLFA AR-15 .450 Bushmaster Complete Upper, 2AE-URC-LJ450BUSH
Caliber: .450 Bushmaster
18in Chrome Moly Barrel
1:24in Twist
A3 upper w/M4 feed ramps
15in floating MLOCK handguard
GLFA big bore muzzle brake
Aluminum/Steel
AR 15 Accessories Y
Caliber: .450 Bushmaster
Other Features: A3 Upper With M4 Feeed Ramps, 11/16in X 24in Muzzle Threads, 15in M-LOK Handguard, Glfa Big Bore Muzzlebrake