A tip for Sig M17 owners/future owners

[Bean1983]

This gun leaks like crazy. Or at least mine did, and from what I can tell, it’s a common issue. I tried fixing the valve on the magazine it came with, but eventually got frustrated, gave up and ordered a replacement. The new one started leaking too! Aaaaargh!!!! Lol. So here’s what I did. I got some silicone spray, and I removed the valve from the top of the magazine by knocking out the two pins that hold it in. I used a punch and a small hammer. Knock them out from the side opposite the cartridge cutout. When they drop out, you’ll notice they’re splined on one end. This is important for reassembly. Now you’ll want to wiggle the valve loose from the magazine and separate the upper and lower, or inner and outer, halves of the valve itself. As long as the lower/inner part is completely intact, you can set it aside. If the nylon gasket and spring are loose from the top of it, see if you can get them back together. If not, I’ll write a post below this one for what to do about that. Now we’re going to focus on the upper/outer half of the valve. You’ll want to remove the metal washer and both O-rings. Take your silicone spray, put the tube on the nozzle, hold it a couple inches away and with the top part of the valve facing upside down (so you can see inside it from the bottom), give it a couple good sprays. Put the smaller o-ring in, and use something to push it down until it pops into its little hole. Now spray another good spray or two of silicone. Next, put the metal washer in and push it down with whatever you used to pop the o-ring in. Another spray or two of silicone. Next put the larger o-ring back in and gently push down on the edges of it until it’s seated on the little lip inside there. Another shot or two of silicone. Keep holding the top part of the valve upside down and wipe off the excess silicone from all around the outside of it. If you need to set it down, keep it upside down so the metal washer doesn’t fall out. Now get the lower/ inner part of the valve. You’ll notice that two sides of the bottom part of this piece are slightly flat, and that there are holes in the sides of the upper part of the valve. Insert the lower into the upper, lining the flat side of the lower up with the holes in the upper. Insert the valve into the top of the magazine and push down on the top of the valve with your thumb and hold it there while sliding the pins back into place. Now you’ll want to reinsert the pins from the cutout side of the magazine, non-splined end first. Push them in as far as you can, then gently tap in with a hammer. Use a punch if you can’t get them flush. You should now be able to insert a fresh Co2 cartridge with no leaking. And remember, NO OIL. If you use oil on the magazine valve anywhere, no matter what type, it will leak. 

 

[Bean1983]

Ok. What to do if the lower part of the valve is not intact. Take the spring and gasket and separate them. Set the spring and valve release to the side. Take the gasket and push out the metal ring in the center. Now what I did was I took a larger punch, roughly the same diameter as the gasket, set the gasket flat on a table, took the punch and gave it two nice medium taps with a small hammer. Then reinsert the metal ring into the center. I recommend doing this while it’s still flat on the table so that the end of the metal ring doesn’t go through the bottom of the gasket. Once you have it reinserted, put It back on top of the spring and valve release with the protruding end of the metal ring facing up. Put it into the lower half of the valve and push it into place. Wait a few seconds to make sure it doesn’t pop back out. What I did was wrap it in a napkin for a minute or two so I didn’t lose any parts if it did pop out. If it pops out, repeat the process of hitting it with a punch and a hammer until it doesn’t pop out anymore but be careful to remember to remove the metal ring and reinsert it. Once it doesn’t pop out anymore, it’s good to go.