Pro Guide spring retainer system for RWS Diana rifles: Part 2
by B.B. Pelletier
Today, we’ll take the next step in evaluating the Air Venturi Pro Guide spring retainer system by testing a stock .22 caliber RWS Diana 48 right out of the box, then installing the Pro Guide system and testing that. Because many of you are interested in working on your own airguns, I decided to turn the disassembly/assembly into a tutorial.
Right out of the box, the first shot from the rifle shooting 14.3-grain Crosman Premiers was 646 f.p.s. I’m telling you that to reassure all of you chronograph hounds that a new air rifle needs a few shots to settle in. Shot No. 2 went 793 f.p.s.–a heck of a lot closer to the anticipated 800 f.p.s. average this model usually gets with .22 Premiers. I shot a dozen times to let the gun settle down, then a string of 10 after that measured an average of 797 f.p.s. – right in the expected range of 790 to 810 f.p.s., depending on the individual rifle. That works out to 20.17 foot-pounds with this loose-fitting pellet.
Now, it’s time to install the Pro Guide system. The rifle’s action was removed from the stock by loosening the front triggerguard screw and the one forearm screw. Then, the action was disassembled while the gun was held in a B-Square mainspring compressor. Don’t look for one on this website; they don’t carry it any longer, but you can make one for under $20. The two-part plans are located here. You absolutely have to use a compressor with this gun.
When the sidelever is off, fold the linkage rod down along the barrel of the rifle, so the action will fit into the mainspring compressor.