Searching AR upper kits

[Ponder_MD]

I have a couple of quick questions about uppers:

1. Is an upper with M4 feed ramps compatible with this mid-length barrel: https://www.del-ton.com/DTI-Del-Ton-Inc-AR-15-16-Mid-Length-Pre-Ban-Ba-p/bl1058a.htm
2. This flat top upper WILL have a way to mount rear sights on it, right? https://www.del-ton.com/AR-15-Upper-p/ur1022.htm

 

[Ammo Jon]

There’s an upper in the classifieds that would be a great part of the build.

 

[Ponder_MD]

There’s an upper in the classifieds that would be a great part of the build.

Seen it. Can't afford it.

 

[outrider58]

I have a couple of quick questions about uppers:

1. Is an upper with M4 feed ramps compatible with this mid-length barrel: https://www.del-ton.com/DTI-Del-Ton-Inc-AR-15-16-Mid-Length-Pre-Ban-Ba-p/bl1058a.htm
2. This flat top upper WILL have a way to mount rear sights on it, right? https://www.del-ton.com/AR-15-Upper-p/ur1022.htm

Yes, there are many options for iron sights for flat top receivers

Feed ramps have nothing to do with barrel/gas length. If you bought an AR barrel that didn't have "M4" feed ramps, any handy person with a Dremel could cut(enlarge) the shallower feed ramps to the M4 contours. You just need to make sure that the upper receiver has M4 feed ramps in it. All flat top receivers(with maybe a hand full of exceptions) should have M4 feed ramps in them.

M4 feed ramps occur from the receiver on into the barrel extension. "Standard"(old) ramps are only cut into the barrel extension.

 

[Ponder_MD]

You guys generally seem good at identifying quality hardware vs. the junk.

I've been sourcing everything from Del-ton but they have been out of complete BCG's for months. I found this on sale at PSA. Is it good or is it junk?

https://palmettostatearmory.com/psa-5-56-nitride-mpi-full-auto-bolt-carrier-group-516446953.html

 

[Ponder_MD]

And while we're at it, is phosphate and chrome lined really so much better that I should bother with it?

https://palmettostatearmory.com/blem-toolcraft-5-56-phosphate-mpi-full-auto-bolt-carrier-group-no-logo.html

 

[SkiPatrolDude]

You guys generally seem good at identifying quality hardware vs. the junk.

I've been sourcing everything from Del-ton but they have been out of complete BCG's for months. I found this on sale at PSA. Is it good or is it junk?

https://palmettostatearmory.com/psa-5-56-nitride-mpi-full-auto-bolt-carrier-group-516446953.html

It's not top of the line, but for the most part, PSA BCG's run fine. I believe they are just rebranded Toolcraft BCG's for the most part. You can expect generally better QC from more expensive brands, but even that is not a hard and fast rule.

My advice - buy it, run it. If it runs, keep it. If this is a rifle that you will be trusting your life to, I'd test it with a decent round count before trusting it in that capacity.

I'd prob want to headspace a bolt to a delton upper. It should be done every time, but especially with the bargain end of the spectrum where QC isn't as consistent in most areas.

Phosphate/ CL carriers are the mil-spec standard. This doesn't inherently make them better than nitride, HOWEVER, many nitride carriers are bored out to the dimensions for the addition of chrome lining, which adds material. This can cause a carrier to be out of spec. Not always the case, but with cheaper BCG's, i tend to err on the side of phosphate/CL carriers and C158 bolts. YMMV and this is purely my opinion.

 

[Ponder_MD]

@SkiPatrolDude Well, it's a phosphate/CL and a Carpenter bolt and it's only $10 more, and a large discount in the price so I guess I'll go that route. Thanks.

 

[outrider58]

This...

https://palmettostatearmory.com/blem-toolcraft-5-56-phosphate-mpi-full-auto-bolt-carrier-group-no-logo.html

 

[babalou]

Yes, there are many options for iron sights for flat top receivers

Feed ramps have nothing to do with barrel/gas length. If you bought an AR barrel that didn't have "M4" feed ramps, any handy person with a Dremel could cut(enlarge) the shallower feed ramps to the M4 contours. You just need to make sure that the upper receiver has M4 feed ramps in it. All flat top receivers(with maybe a hand full of exceptions) should have M4 feed ramps in them.

M4 feed ramps occur from the receiver on into the barrel extension. "Standard"(old) ramps are only cut into the barrel extension.

this right here!!

 

[omegared24]

I'd pay extra for Microbest.

https://palmettostatearmory.com/psa-custom-full-auto-phosphate-bolt-carrier-group-by-microbest.html

 

[Ponder_MD]

This...

https://palmettostatearmory.com/blem-toolcraft-5-56-phosphate-mpi-full-auto-bolt-carrier-group-no-logo.html

That's what I ended up getting.

Here's a question- As a southpaw, I've been catching hot brass in my collar for 20 years. If I buy a leftie upper receiver, are there any other parts that need to be "left handed" in this build? I purchased an ambidextrous charging handle already.

Edit: Nevermind...the BCG needs to be a leftie also and I just ordered a rightie.

 

[outrider58]

That's what I ended up getting.

Here's a question- As a southpaw, I've been catching hot brass in my collar for 20 years. If I buy a leftie upper receiver, are there any other parts that need to be "left handed" in this build? I purchased an ambidextrous charging handle already.

Edit: Nevermind...the BCG needs to be a leftie also and I just ordered a rightie.

If you need to get rid of the 'rightie', I'd be glad to take it off your hands at your cost, depending on how far away you are...