I still have the MK1 I bought 40 years ago and it is still shooting after some new seals a year ago.
I still have the MK1 I bought 40 years ago and it is still shooting after some new seals a year ago.
Well...after some quality time with the dremel, and a bunch of sanding/buffing, I finally got all the casting marks and imperfections in the frame smoothed out. I then went to see a buddy who has a bead blaster, only to find out that he's in Florida 'till the end of Feb!.... So much for bead blasting...
I took it back home and went over the whole gun with 800 grit wet/dry sandpaper, then washed everything off with Varsol. Each piece was blow dried and painted immediately, before oxidation could start. I ended up putting on 4 coats of Krylon Camo Flat Black. Looks good, just not sure how durable it is. Guess I'll find out soon enough!
The cocking knob, bolt knob, and safety were all given the wire wheel treatment, polished, and clear coated for a bit of contrast.
Ready to assemble (and...NO... the barrel isn't bent! Wonky camera angle, or something)
TD 037.JPG
I know I should have let the paint cure for 5 - 7 days rather than 36 hrs, but..well...you know how things go! Gingerly got everything back together without marring the paint, and except for the scope (which I haven't purchased yet), she's pretty much done - for the moment, anyways. I'm using the factory grips for now, but plan on getting a custom set later on.
TD 038.JPGTD 039.JPG
Comparison of my new MK vs stock. Don't mind the condition of bottom gun, it's my next 'refurbish' project!
TD 040.JPG
I haven't scraped up enough cash yet for my next order (pump, scope, light kit for chrony, among other things), so for now I'm limited to Co2 (12 gr). Good enough for a baseline, plus, I did say that I would show you some #'s.
So with daylight fading, I took a Co2 end cap from one of my other MK's, set the chrony up on its stand (roof of car), and grabbed some CPHP. I'm not sure how accurate the numbers are, as it was only +2* C outside. I would take 2 -3 shots, go inside for 10 min or so, back out for 2 - 3 more, and so on - so take it for what it is. I really need to set up some chrony lights in the basement!
Anyways, here is some #'s from her maiden voyage:
1 - 497.2
2 - 510.4
3 - 519.7
4 - 531.4
5 - 530.1
6 - 538.1
7 - 537.8
8 - 539.6
9 - 539.1
10-536.7
I am quite happy with the results so far, to say the least. Obviously I'm going to have to "de-tune" it to keep it legal - either by lowering reg pressure, or hammer spring, or both - but not before I try it on HPA in its current configuration (stock hammer/valve springs, reg pressure, etc...) and see what it is capable of...
HPA is less dense than Co2 (therefore flows more easily), so if these numbers are even half-arsed accurate, then......!
Once I get my pump and can actually do HPA, I will do a proper set of shot strings on both Co2 and HPA, as well as shot count and some accuracy tests.
'Till then, cheers!
Todd
Todd
Don't sweat the petty things, and don't pet the sweatty things!
You will find that adding hammer spring past a certain point buys nothing in velocity.... On the other hand, having too light a hammer strike will result in the velocity increasing below the regulator setpoint.... Check out this thread.... http://www.canadianairguns.com/showt...-Hammer-Strike
You best balance between performance and shot count will occur when the hammer strike is balanced against the pressure just as if you have a non-regulated PCP running right at the top of the bell-curve....
Bob
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count!