***** WINNER ****
Bought a used air rifle by Ed Krzynowek
http://www.network54.com/Forum/79537/message/1154075128/
****************** OTHER NOMINATED ONES BELOW ****************
1. Pellet trap done right....finally.
http://www.network54.com/Forum/79537/message/1151852244/
2. Drill press use by DAQ
http://www.network54.com/Forum/79537/message/1153340858/
3. The DDay 001 and 002 Field Targets
http://www.wlopa.com/dday_target.htm
Text of winner below
Mixing and matching the parts from different rifles with the same model number can be a little tricky. It can cause some odd, very hard-to-find problems. Said another way, be careful of playing musical airguns with the parts from different guns--lol. The situation came up again during another tune, and it could happen to anyone who buys, swaps, or collects air rifles. A lot of guys here do that, so I decided to post this.
I got a nice R7 in here to tune a while back, and I was trying to finish it up. But, there were a few extra hitches, and they had to do with the mismatching of some parts that were apparently from different R7's.
The first thing I noticed was that the stock didn't quite match the receiver inletting. The R7's/HW 30's have more than one stock-fit arrangement, depending on their production date. In this case, the action was sitting too high in the stock, so I adjusted the inletting. There, all better.
Oops--not so quick! Now the large stock screw in the trigger guard didn't hold the action tightly-enough inside the stock. Accuracy probably would have been poor.
Was it too long a screw, or simply the wrong part? No. Instead, the trigger block didn't match the receiver. BOTH were tapped to receive the stock screw, and not surprisingly, the threads didn't align properly at all. The way the receiver is constructed and tapped is different on various R7's. So, I had to chase the threads on the trigger block with a 6 mm tap, so the screw threaded all the way in (other than completely drill out the threads on either one), and that solved that problem.
There were a few other things in this case. But my point is, that if you buy used guns (previous tinkering is thus unknown), or if you tend to take apart your own guns and are tempted to swap parts (Hey--they're both R1's, right?), you should make a point of making sure the parts fit correctly, and then 'keep like with like'. If you don't, some of the differences are so subtle, you may develop unusual problems that can drive you nuts: Guns that won't cock, triggers that don't adjust right, accuracy problems--you name it.
If you ever take more than one 'model x' apart at the same time, you can earmark the parts, so you know which part goes with which. Otherwise, you may have to have a lengthy parts swap session, one part at a time, until you figure out what it takes to make everything work properly again. And, although it was about the R7 this time, many other makes and models will demonstrate very similar types of problems.
FWIW, although this particular owner has more than one R7, he might not have done any swapping himelf. It could have been done by the previous owners. Even if he did do it, it could easily happen to anyone, because the guns do have the same model number. That could lead someone to assume it's not going to be a problem. Thus, no hard feelings are intended or implied by this post.
I've had more than one 'spare parts gun' in here, that's what I call them. If the time I have to spend on one is above and beyond, I usually have to charge a little extra. So, if you've done such swapping, or if you bought your airgun used, you might want to tell your tuner that in advance. It can save you BOTH some time and trouble.
Regards,
Ed
The Airgun Tune-Meister
http://members.aol.com/_ht_a/ekreally/myhomepage/business.html
"We can rebuild the squirrel. Make him stronger, faster...We have the technology"---S.M.
Steve
Yellow Forums Owner
http://www.yellowforum.com
"Evil happens every second, good does too"
