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PostPosted: Tue Nov 05, 2013 4:27 pm 
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Joined: Thu Oct 10, 2013 5:22 pm
Posts: 323
Location: Vancouver
Last night I picked up a refurbished 90 two from Princess Auto for some dirt-cheap shooting. I'm pleased that it has a full size magazine housing both CO2 and BBs, and it has both single and double action firing. Only major complaint is the lack of adjustable sights.

I don't know the reason why this gun needed to be sent back to the factory, but the major issue I found with it after bringing it home is that when the magazine is more than 50% full, the trigger is extremely difficult to pull, basically I had to squeeze it with all my strength and then it breaks suddenly causing the gun to jerk, if I can break it at all. I don't know but I'm thinking maybe 40+ lbs pull. I have a pretty powerful grip but with a full magazine it was impossible for me to break the trigger.

I narrowed the problem down to the BB magazine. There is a recess at the top of the magazine which prevents BBs from falling out into the chamber, and a kind of tube pushes the BB forward into the chamber when the trigger is pulled. The recess is a bit too deep, so the process of chambering needs to push the BB downwards against the force of the follower, and when there are many BBs in the magazine, this force is too much for the forward motion of the chambering mechanism to overcome.

The simple fix was just to partially fill the recess in the magazine with a tiny dab of JB Weld. Chambering is still a little stiff with a full magazine, although it is now well doable and is completely possible to control. Feeding is now exceptionally smooth once the magazine has been half emptied.

I have attached a very crude illustration of the problem and the fix, I hope this can help other owners experiencing this problem. Now that I can actually control the trigger, I can do some more accuracy tests tonight. It's a nice BB gun for the price.

90two_magfix.png [ 32.95 KiB | Viewed 421 times ]
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