[DUNNBROKEUS]

Does anyone have any information on an Factory Colt AR-15 pre ban barrel in a 6x45 cal?. I own one and have had several local experts look at it and scratch their heads. It is like new and is 6mm in caliber but the case is a.223. A set of dies came with it and they are Redding and marked 6x.223. Would appreciate any information - Thanks in advance

 

[DUNNBROKEUS]

Update: Received a phone call reference the 6x45 AR15.
Was advised that it was experimential production during Viet Nam as a sniper configuration. US Military wanted a heavier bullet for the jungle. Still looking for documentation.

 

[jp58c]

Came across some info earlier, one of the accuracy books.6x45 refered to a benchrest according to this book.I'll try and locate book and authur's name.:usa:

 

[DUNNBROKEUS]

JP58C --- I took it to two big gun shows in the past month. I showed it to several "experts" on AR 15's. All I got was a bunch of head scratching and not much information. One dealer said that he had heard of only one other and it was in the hands of a Collector. He advised that he had "heard" that Colt had built less than 50 but more than 10 of the barrels.
Still trying to find documentation. I was advised to contact Colt. That is probably a good idea. Thanks for the reply -

 

[Kaliburz]

That's a very interesting story. I didn't know that the 6x45 was that old......

I'm gonna link this thread to a new post on AR15.com and see if anyone there can help you out too.

Edit....didn't know you posted there.....

 

[DUNNBROKEUS]

ADDITIONAL INFORMATION: TALKED WITH A MAN AT HOUSTON GUN SHOW WHO ADVISED THAT ARMORY AT LACKLAND AFB IN SAN ANTONIO TESTED M-16/AR-15 BARRELS IN DIFFERENT CALIBERS IN THE 1960'S. HE SUSPECTED THIS WAS ONE OF THOSE BARRELS. HE HAD BOUGHT FROM MILITARY SURPLUS A PAIR IN .17 CAL AND IN 6MM. PAID $65.00 EACH FOR THEM THIRTY YEARS AGO. SOME WERE USED IN NATIONAL MATCH COMPETITION IN THE 6MM AND WERE VERY ACCURATE OUT TO 200YARDS. BUT THE .308 M1A OUTSHOT THEM AT 300YARDS. STILL LOOKING FOR DOCUMENTATION.