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Murdoch · July 8th, 2007, 14:55

Just an update for any of you attempting a similar mod:

I've managed to completely thread the PDI delta ring on to the G&P Zombie receiver. My attempts to sharpen the poorly cast threads failed miserably. I even tried ordering a die but it turned out to be the wrong size (anyone need an M30x1.5 hex die?). So instead of hacking away on the threads, I tried attacking from the other side. The delta ring threads were well defined but they were tapered off, from inside to out. So what I did was throw the thing in the lathe and cut down the deeper cutting threads so they wouldn't dig into the shallow 'valley's' on the receiver thread.. It's a pretty lame solution, but imho, it turned out really well. The delta ring is not loose at all, and has clamped the outer barrel down tight. Here are some pics to clear up my jibber jabber

Just a quick look at what to expect...

Now having cleared that hurdle I find a bunch of problems with getting the body to close properly AND getting the rear collet to fit on the stock tube.

It's frustrating but enjoyable to work on, but I have to admit, I am pretty disappointed in quality of this receiver. I haven't even mentioned the ejection port cover and charging handle, but they too require a lot of tinkering. I realize this is what happens when you use aftermarket parts from different manufacturers, but god help you if you buy this and don't have the tools to work on it... I hope to hear comments and criticisms..

July 8th, 2007, 14:55	#4
Murdoch Trader rating Join Date: May 2006 Location: Scarborough, Ont.	Just an update for any of you attempting a similar mod: I've managed to completely thread the PDI delta ring on to the G&P Zombie receiver. My attempts to sharpen the poorly cast threads failed miserably. I even tried ordering a die but it turned out to be the wrong size (anyone need an M30x1.5 hex die?). So instead of hacking away on the threads, I tried attacking from the other side. The delta ring threads were well defined but they were tapered off, from inside to out. So what I did was throw the thing in the lathe and cut down the deeper cutting threads so they wouldn't dig into the shallow 'valley's' on the receiver thread.. It's a pretty lame solution, but imho, it turned out really well. The delta ring is not loose at all, and has clamped the outer barrel down tight. Here are some pics to clear up my jibber jabber Just a quick look at what to expect... Now having cleared that hurdle I find a bunch of problems with getting the body to close properly AND getting the rear collet to fit on the stock tube. It's frustrating but enjoyable to work on, but I have to admit, I am pretty disappointed in quality of this receiver. I haven't even mentioned the ejection port cover and charging handle, but they too require a lot of tinkering. I realize this is what happens when you use aftermarket parts from different manufacturers, but god help you if you buy this and don't have the tools to work on it... I hope to hear comments and criticisms.. Last edited by Murdoch; July 15th, 2007 at 01:19..