Ar problem

[Cmcmill]

I got a hell of a deal on it. Plus this is my first AR I wanted to buy a good starting platform from the get go. Now that il learning a lot more about the whole AR line of rifles my next one will be a custom build. Already have some good ideas but can't make up my mind on what caliber I want to do.

 

[Hump66]

Just do a 300 black out upper.

 

[Cmcmill]

Will that fit with my lower? I was curious about that I know a .308 won't so a 300 blk out will? What about a 6.8spc will it work with a 5.56 lower?

 

[Hump66]

Yep. Same mags, bolt, etc. basically the only difference is the barrel. 300 BO is a .223 case cut down and re-necked for .30 cal. 6.8 I don't know about.

http://en.wikipedia.org/wiki/300_AAC_Blackout_(7.62×35mm)

 

[ASP785]

The 6.8 will work but having to have a separate bolt and mags was a deal breaker for me. Well that and the disaster that was their SAAMI standardization.

 

[uncle money bags]

Ha!

There are some seriously better off the shelf options than Colt in the same price range. BCM comes to mind.

I cannot disagree with that. Love me some BCM.

 

[Cmcmill]

Hmmmm that the only caliber I haven't had a chance to shoot yet the .300blk. A friend of mine has a POF .308 sbr I got to shoot last weekend holy carp it was love a the first trigger pull super nice rifle but super pricey as well.

 

[leemozoid]

The castle nut on my 6920 lower is factory staked. It came with a Magpul end plate with the loose swing swivel on the rail. Is that why?

 

[uncle money bags]

The castle nut on my 6920 lower is factory staked. It came with a Magpul end plate with the loose swing swivel on the rail. Is that why?

I dont understand the question. Is what why?
If you are asking if it is staked to prevent the nut from moving and the receiver extension from coming loose, then yes.

 

[Cmcmill]

Went shooting last weekend the gun jammed again. Had to bring it home remove the buffer tube and tap the bolt in with a rubber mallet to fully seat the round then had to pull the charging handle back like a mofo to get the round to eject. The I ran about 80 rounds through it pulling the charging handle and a few of the bullets had caught on the feed ramp and nicked a chunk out of the tip of the bullet. Any idea on what would be causing this. Only happened with the reloads none of the store bought stuff did it.