While not on your list I prefer the Young chrome BCG. Chrome os a great coating and their machining is top notch.
But for me I like them specifically because their bolts are not HPT, to me this is boarder line destructive testing. A KAC SME likened it to testing an engine with out oil to make sure it works. IMO it’s an asinine test that is not needed with good machining, good metal and MPI.
Berserkr556,
Thank you very much for taking the time to list the spares I need.
I really appreciate it.
Berserkr556,
I forgot to mention, the sale for the Sionic NP3 BCG is over and their normal cost for that BCG is back in effect.
I haven’t a clue what bcg to buy now.
If you’re buying just to have spares and not to sell, just buy a bolt or two. That carrier really isn’t going to break anytime soon. A quick search on Brownells showed Colt bolts for about $100 and DD for $69. BCM sells theirs directly for $80.
Going off of Abraham’s question, I can get WMD BCGs for pretty cheap through work. Cheaper than buying any of the BCGs listed here. Is there any reason I would not want to get a WMD and pony up the extra cash for a BCM, DD, etc?
I have heard very few positive things about the NiB BCG. I’ve never used one because of it, but unless you are talking 2 for 1 prices I don’t think many people are going to say get the WMD. Do a search. There’s at least a couple good threads about that topic.
I just did a search here and it looked like people have nothing but good things to say about them. Which threads list the major problems of the WMDs?
Wake27,
Thanks for the heads up on BCG’s.
And yes, I just want one for a spare.
I’ve narrowed it down to BCM or Colt. Colt is about $30 more. Any reason to go Colt over BCM? Any leads on Colt BCGs less than $200?
Colt BCG for $180
https://www.armsunlimited.com/Colt-M16-AR15-Complete-Bolt-Carrier-Group-Assembly-p/sp64028.htm
They were $150 not too long ago.
No one has mentioned Stag Arms which is Continental Machine Tool. Their Bolt carrier groups are GTG and usually run a little less than some others. They are $125.00 right now for M16/158/mpi/hpt/phosphate. I have snagged them on sale for $100 in recent past. They seem to run sales often in this buying climate.
This has been my experience as well, I would not hesitate to use one after my experiences.
CMT is one of the companies that makes replacement parts (like the BCG) for the DoD. Stag is their commercial side, so not sure if it’s same-o-same-o. However, CMT itself should be GTG without a doubt.
On this day(10-July-2015)it is PSA by far. $79.99 for their 5.56 Premium full auto BCG. Here are the spec’s.
Milspec Carpenter No. 158® steel bolt
Shot Peened Bolt
High pressure tested
Mag particle inspected
Chrome Lined Carrier (AUTO)
Chrome Lined Gas Key
Gas Key Hardened to USGI Specifications
Gas Key Grade 8 Hardened Fasteners
Gas Key Staked Per Mil-Spec
Tool Steel Extractor
Extractor Spring
Extractor O-ring Insert
I may try one of these. I have yet to try a NP3 BCG.
+1 on the Young chrome. It’s my current favorite. Wipes down so easy.
Aim Surplus $100…
Once again they are as good as they get, PSA Premium bolt carrier group $79 and change plus shipping for $8.00 and yes it has all the MPI HPI CIA SUV SVU FBI testing 
.
PSA is a junk factory.
I wouldn’t trust them to assemble a sandwich.
Agreed…the horror stories alone is enough for me. It amazes me the risks people will take using inferior products just to save a couple bucks on a weapon that could ultimately save their lives, or the lives of their families and brothers.
If you yahoos are at the point that you’re starting your posts (deleted now) with “So, douche…,” please consider taking our shoes of and putting your shoes on your hands before you start banging on the keyboard.
The gibberish that’ll appear on the screen results will be just as worthwhile, and it might prevent you from hitting the Submit button.