Request info on AR build (.300 blackout)

[Pye]

Howdy Folks !

I am a newbie at an AR build(for a .300blackout). I recently purchased a BCM(Bravo) upper for a .300 blackout. I currrently have an AR 15 lower from Aeroprecision. I am asking from all of you experienced veterans with AR builds, if this combination will work or do I need to buy another lower/upper to get a better fit and function?
Thank you for any advice you can spare, in advance !
Happy and safe 4th !

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[slimmer13]

Personally, I don't like mis match but it will function fine.

 

[Member 34319]

They will work with each other, yes.

 

[Lazyfaire]

I too like using the same maker for uppers and lowers. But at a minimum make sure the upper is the better quality, because it mates up with a barrel of quality (hopefully). A lower can be switched around or upgraded much more easily in the future.

 

[titsonritz]

It makes zero difference, you'll be fine.

 

[jbett98]

What buffer & spring is currently installed in the lower?

 

[titsonritz]

What buffer & spring is currently installed in the lower?

Most likely a crappy carbine buffer and spring, I'd throw it in the garbage and get and quality H buffer if not an H2 especially if running suppressed.

 

[Firemansim]

As long as you haven't mixed mil-spec with commercial, Legos are Legos.

 

[FullMetalJerk]

 

[FullMetalJerk]

Most likely a crappy carbine buffer and spring, I'd throw it in the garbage and get and quality H buffer if not an H2 especially if running suppressed.

Tubb spring and PWS buffer.

 

[quneur]

You may need an AR Wedge like this one if the upper and lower rattles:

Leapers UTG Accurizing Wedge AR-15

The UTG AR-15 accurizing wedge will improve upper and lower fit, and improve accuracy. The wedge is placed in the lower receiver beneath the rear...

www.midwayusa.com

It will still shoot just fine without it.

 

[andreys21]

Everything mil-spec fits like reproductive organs: perfectly functional

 

[Pye]

Thank you all for the great feedback. I will make sure I get a high quality buffer, bufferspring, etc. This is an exciting time to be able to put your own rifle together.

 

[FourFront]

You may need an AR Wedge like this one if the upper and lower rattles:

Leapers UTG Accurizing Wedge AR-15

The UTG AR-15 accurizing wedge will improve upper and lower fit, and improve accuracy. The wedge is placed in the lower receiver beneath the rear...

www.midwayusa.com

It will still shoot just fine without it.

Aero lowers have a tension screw so you don't have to put junk like this in your gun.

 

[Prefontaine]

I've got a question for you all: My 300 build has a 7.5 barrel. Even after tuning the Superlative gas block so it ejects rounds cleanly in the right direction, it doesn't want to lock back on an empty mag. I'm shooting Fiocci 220gr subs (what I could get). Supers shoot fine. Using a standard carbine buffer and spring.