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fishmishin
11-08-2009, 02:23 PM
I am in the process of building a pump mag, and I have a question. When I shoot my pump mag I don't have to actually use the pump to shoot. Have I done something wrong here or is that just the way they work? For some reason I seem to be having a hard time grasping the whole idea of using a regular bolt spring along with the wave spring. If someone can help me it would be great.
vf-xx
11-08-2009, 03:19 PM
Some people do cut down their mainspring. You could always try the lightest LX spring and see if that works.

Did you remember to cut down your bumper?
fishmishin
11-08-2009, 03:23 PM
Hmm, yeah I hadn't tried trimming the spring yet, and yes did I cut the bumper down.
kwood
11-08-2009, 04:49 PM
check this video out
he does a little explanation about how the springs work together
http://www.youtube.com/watch?v=ECCOtUMm1pw
Brewtt
11-08-2009, 08:33 PM
Check my(and other) suggestions in this thread:

http://www.automags.org/forums/showthread.php?t=246352
fishmishin
11-08-2009, 11:17 PM
check this video out
he does a little explanation about how the springs work together
http://www.youtube.com/watch?v=ECCOtUMm1pw

That did help a lot Kwood thank you. I knew it had to be simple. I ended up going back and tuning it in semi after posting and found out I needed to change out the stock spring with a .225 spacer. That solved the problem with it shooting in semi. Now I have to make a longer pump rod, I am thinking the first one I made isn't quite long enough. I didn't have much to go by since I couldn't get a length on the rod itself, I just kinda eyeballed it. I don't think it has to be much longer now to reset the bolt all the way. It will reset it every now and again, but not far enough consistently. Anyway I will update my progress. If anyone has made their own rod before and wouldn't mind telling me what thickness round stock they used that would be cool. The 1/8" I picked up was to large. This time I used welding rod.
Ando
11-08-2009, 11:25 PM
Fish...Ck this out

http://automags.org/forums/showthread.php?t=244591&highlight=pump+rod
fishmishin
11-08-2009, 11:45 PM
That will help a lot, thanks Ando !!

Actually I don't have a ruler in 100ths so, check me on this. By the pics it would be just shy of
5 5/16" right?

If so the first one I made is 1/4" to short.
Ando
11-09-2009, 07:24 AM
Ya it's a smidgen over 5 1/4 so you should be right on.