Re: .233 ammunition versus 5.56 pressure problems
D9, I think you will find Koganinja is most likely correct. All AR's are not created equal. I say this for everyones value and infer nothing on you knowledge or builds.
Her is the deal, There is a standard called MilSpec and everyone is suppose to meet its tolerances. Most of the big guys, Colt, DPMS, Bushmaster, Armalite, and Fulton Armory are just about spot on with the MilSpec guidelines; however, not everyone has the quality controls that the big guys have. Most of the smaller guys are good with tolerances on most stuff, Stag Arms, Saber Def, Mikes, Spider, etc... but there are a few that have an awesome concept and fail to meet all the tolerances. An example of this is my POF. The lower was very innovative in design features like the enlarged permanent "V" shaped trigger guard, Wide beveled mag well etc... But some of the holes for pins were drilled too small and I had to open them up. Additionally the cut-out for the Bolt Latch spring was not drilled deep enough. Although, these were of no issue to me as I was able do the little amount of gunsmithing that was needed. To someone who has never experienced these kinds of issues, they may presented a problem. The lesson here is, know what you are buying. A less expensive product may not have the quality you would expect. I know of issues in the past with Rock River Arms uppers being out of tolerances, they seem to have addressed them since then. And I have also seen issues with mass produced barrels (often sold by big parts clearing houses like Model 1). I have even heard of issues with Bushmaster parts but I have never had issues with them and I consider them 1st rate. Often people blog about issues with a gun made from a variety of manufactures parts and incorrectly identify the issue to begin with.
But I digress, As I stated before, these may not be your issue with this weapon but everyone should know who makes the parts they are building with and understand that all AR's are not made equal. Just my 2 cents.
