Airsoft Canada - View Single Post - To finally answer the TM M3 + PDI SPAS 12 Spring quesiton

TheToastmaster · August 10th, 2007, 06:02

It's been considered and asked many times in the past.
Will the PDI upgrade springs for the SPAS 12 work in the M3, which has nearly identical internal parts?
The simple answer: no.
The spring, even when fully compressed is too long to allow the gun to cock far enough back for the piston to lock back and let you fire. It goes almost all the way, and will go no further back.

This is for the PDI 0.8J spring, though I don't know for certain about the others, one can safely assume that the 0.8's bigger brothers will not be shorter when compressed. I will look into the possibility of cutting the spring down, but with an upgrade spring, what's the point of shortening it to make it fit? No doubt the reason for the M3 having 2 springs (one inside the other) rather than one like the SPAS is because of the small space that they have to compress into to cock.

The good news is that the PDI piston head set works beautifully!

Research since the creation of the thread has suggested that the J rated springs will not work in the M3, but the % rated variable pitch line from PDI will...

August 10th, 2007, 06:02	#1
TheToastmaster Trader rating Join Date: Jan 2005 Location: Winnipeg. In a hole.	To finally answer the TM M3 + PDI SPAS 12 Spring quesiton It's been considered and asked many times in the past. Will the PDI upgrade springs for the SPAS 12 work in the M3, which has nearly identical internal parts? The simple answer: no. The spring, even when fully compressed is too long to allow the gun to cock far enough back for the piston to lock back and let you fire. It goes almost all the way, and will go no further back. This is for the PDI 0.8J spring, though I don't know for certain about the others, one can safely assume that the 0.8's bigger brothers will not be shorter when compressed. I will look into the possibility of cutting the spring down, but with an upgrade spring, what's the point of shortening it to make it fit? No doubt the reason for the M3 having 2 springs (one inside the other) rather than one like the SPAS is because of the small space that they have to compress into to cock. The good news is that the PDI piston head set works beautifully! Research since the creation of the thread has suggested that the J rated springs will not work in the M3, but the % rated variable pitch line from PDI will... __________________ Toast Last edited by TheToastmaster; August 10th, 2007 at 06:06..