Recent content by Luckyshot

If you can remove the breach seal without it breaking apart, you could replace the seal with a backer of paper or masking tape to shim it up. This might suffice until the replacement seal arrives. I did this once and my LP53 worked fine for many shots. I eventually bought a suitable O-ring from...

Crosman Premieres were at one time held in high regard by many shooters, though maybe not the best choice for the LP53. However it was the closest I had on hand to 8gr which I consider the standard in .177 for testing velocity.

A pellet insert is simply a probe small enough to push the pellet 1/16" or 1/8' onto the lands of the rifling.

Thanks for posting your results. My LP53 has the TR Robb piston head installed, however those numbers look very comparable to mine. Here are my numbers with 7.9 Premieres; 385, 371, 371, 380, 385, 351, 378, 376, 376, 376, 378. Ave fps in this string; 375. By using a pellet insert, velocity...

Just my humble non-solicited opinion as a non-expert on the LP53. I installed a Robb piston seal on my non-modified LP53. I thought it made the recoil action harsher than the original leather seal. No real difference in fps. I'm going to try fabricating a new leather seal to see if there is an...

I'll solve the mystery for you. Not a roll pin. The spring guide was fabricated from a Daisy bb gun spring guide. I cut it down to the desired size. The slot allowed me to pry it open to the desired diameter. I inserted a spacer into the guide to fit snuggly on the screw-on cap.

This was the original spring. My dad purchased the gun new in 1961.

By "close coil" do you mean a "tired" mainspring? The guide fits snug but moves freely when the spring is compressed.

In the 2 spring mode, my LP53 seemed to compare favorably with other reports of fps I came across. Here's the pic of the single spring/ guide set-up I tried out. I didn't remove the piston with the T.Robb head due to it being a PITA to remove.

I finally got around to experimenting with my 53. I did try the single spring route and had results opposite of your's. The single spring (with homemade guide) produced only 290fps. When using both springs, it was putting out 378fps. Previous to this experiment I had installed the T. Robb...

The Rocket 262 has a high and low power setting. It has plastic grips where the 252 has wood. The 252 is more compact at 8" long compared to 9.5" for the Rocket 262. There are probably other differences I am not aware of.

Did you obtain or fabricate a spring retainer when opting for the single spring set-up?

Hope the barrel swapping works out. I'm not a fan of big heavy springers spitting out tiny .177's. I don't know anything about the Ruger Yukon, but it's a good-looking rifle with attractive wood. Nice buy for $80.

I don't know anything about the 392 except that it's quite different than the Sheridan Model CB of old. Different trigger mechanism, safety, and power plant. I just resealed a little used 1961 Sheridan I was given. I chrony'd it at 670-680 shooting 14.3gr pellets with 8 pumps. This equated to...

I wonder if removing the smaller spring would increase performance. Probably need a larger diameter spring retainer though. Actually, if the fps remained about the same it would be a win from the perspective of input vs output as long as firing action was not adversely effected.