AR9 issues update. Not easy solution.
This is a follow up of the post Disappointing AR9 news.
For those coming late to the festivities, I acquired from different sources a 9mm KVP upper and a Spike’s Tactical lower (Glock mag compatible) and they refused to mate properly.
On a rare attack of common sense, I decided to email both Kaw Valley Precision and Spike’s Tactical to get some answer. First of all, both companies were exceedingly fast on replying to my query for which I am happy and encouraged since past experiences with other companies have been utterly disgraceful.
Ian Reel from KVP was upfront and stated that he had not seen many lowers like mine. I won’t deny I would have been a tad incredulous, but reader @Snarkyposters from X (thankyouthankyou) had already pointed me to several AR9 sources of information and I formed the suspicion that this platform is a cluster flock of seagulls.
And then I got the email from John Dowhy of Spike’s Tactical which gave me the final answer to my question(s):
Hi Miguel,
Our Glock-style 9mm Lower has a LRBHO bracket that runs along the side of the magwell. Our 9mm Uppers have a relief cut (in the picture attached) to accommodate for that bracket. Other brands of Uppers often do not fit with our Lower because of just what you highlighted. The Upper hits the bracket and cannot close.
There is no Milspec for 9mm AR’s so mixing brands can be problematic. We have had customers make a relief cut themselves in other brands of Uppers or abandon the other brand and use our Upper.
Bingo! Let me show again the photo of my upper:
The arrow points to the point of unwanted contact between upper an lower and the upper does not have the relief cut.
Mystery solved. Problem? Not so much.
There is no Milspec for 9mm AR’s so mixing brands can be problematic.
Those are words you need to live by if you want to build your AR9.
Right now, I see myself with two AR9 half builds and nowhere to go unless I decide to sink more money in the project which I am not happy to do. I may go with a regular 5,56 lower and one of those adapters for the magwell, but the good ones cost almost as much as a dedicated lower.
I’ll just hit the pause button for a while till some smarts come to me.