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LUTNIT · February 8th, 2008, 12:34

What is the threading for the front end of an armalite receiver/back end of a RIS/RAS? Its just that I was told PTW's have a standard threading because they can fit real steel front ends out of the states which are, of course, standard. But just the other day I was helping two guys assemble PTW's and the G&P RIS fit perfectly onto the PTW, meaning its standard. Back when I had a G&P SR-25 I put a KA RIS on it and it fit fine, so is KA standard as well? I recently bought a Madbull dragonfire RIS and it was metric threading, didn't fit the PTW receiver at all (neglected to test it on the G&P receiver.) Just that there was a thread in the accessory sale section about someone selling a metric RIS because their very old ICS armalite had standard threading. Was it just a fluke that he got a metric RIS or whats going on?

February 8th, 2008, 12:34	#1
LUTNIT Trader rating Join Date: Dec 2005 Location: Ottawa	Metric or Standard? What is the threading for the front end of an armalite receiver/back end of a RIS/RAS? Its just that I was told PTW's have a standard threading because they can fit real steel front ends out of the states which are, of course, standard. But just the other day I was helping two guys assemble PTW's and the G&P RIS fit perfectly onto the PTW, meaning its standard. Back when I had a G&P SR-25 I put a KA RIS on it and it fit fine, so is KA standard as well? I recently bought a Madbull dragonfire RIS and it was metric threading, didn't fit the PTW receiver at all (neglected to test it on the G&P receiver.) Just that there was a thread in the accessory sale section about someone selling a metric RIS because their very old ICS armalite had standard threading. Was it just a fluke that he got a metric RIS or whats going on?