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Messages - Mintie

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Modifications / Re: Improving the accuracy from a Crosman 1077
« on: March 11, 2019, 12:01:46 PM »
Small update on this as there have been people asking about 1077s recently on social media.

Since writing this thread I have tuned up another 3 of these and always seem to find the same results as above, well below average grouping and poor velocity consistency out of the box. The mods mentioned above always seem to pull the accuracy into line and give a slight boost to the power however so if you are sitting on the fence about one and want to have a tinker I would suggest you give it a go, once they rre sorted they are good fun for plinking at tin cans, very back yard friendly with a nice little carbon fiber suppressor on it too!

The groups pictured here were both full mags at about 18m

Members Reviews / Re: B30-1 .177 teardown
« on: February 27, 2019, 07:38:42 PM »
Look forward to hearing more about this, Always fancied one!

For Sale, Wanted, Spotted / Crosman PRO 77
« on: February 18, 2019, 05:18:09 PM »
I have a Crosman PRO77 up for sale. This is a co2 powered, Blowback, Semi Auto .177 Steel BB pistol which would make a great training rig for shooting in the garage. The slide jumps back quite realistically, it has all the controls in realistic places and it holds the slide back after the last shot. The body is plastic but the trigger and slide are metal. I believe there are groups doing IPSC style comps with pistols like these now too.

I was going to list on trademe for $200 but happy to sell to any of our members for $150 and I will throw in a pack of BBs. Cool pistol with some sweet features, you cant buy pistols like this in shops here anymore thanks to a new permit process the police have put in place where they basically decline all permits.

There is a rail on the bottom but the last owner butchered it up a bit so it probably wants to be ground off and a new section of alloy rail mounted there. Seals are all good and it functions well, has just been cleaned and lubed.

Located in Hawkes Bay, Could deliver between HB and Wellington this week if you are quick.

Modifications / Re: Project 2550
« on: February 03, 2019, 09:59:22 PM »
I've still got all the bits here, and now have a QB79 on it's way that  might actually make a better base for more power. I also have a few more 25 cal barrels to choose from now so maybe I will do one on each platform?

Modifications / Re: Mini Carbine.
« on: February 03, 2019, 08:51:05 AM »
Very keen to see pics once you figure it out! Love tiny carbines

General Discussion / Re: Police shooting at car.
« on: February 01, 2019, 11:25:46 PM »
Have just seen video of the police shooting at the car. Very poor effort on their behalf and very very dangerous for the public. This was at a busy intersection in an area with lots of people around, the screen shot I have here is where it all happened.

General Airgun Discussion / Re: Dive Tanks. Failures
« on: January 21, 2019, 02:37:58 PM »
I reckon the way to go now is one of the small compressors to direct fill the rifle and a 500cc CF tank that you can take with you out in a backpack for top ups in the field. I have the 500cc tank all setup now but need to get a compressor one day.

General Airgun Discussion / Re: Dive Tanks. Failures
« on: January 21, 2019, 09:38:30 AM »
Good to see you back on here Microbugs!

Modifications / Re: Have Chronograph. Will Measure!
« on: January 21, 2019, 09:33:35 AM »
Something is wrong with your Crosman, off the shelf a 2240 is about 6fpe and the 2250 barrel gets it up to about 8-9fpe. Generally you will get higher FPE from heavier pellets which leads me to think that your transfer port seal is probably leaky, heavier pellets are producing less energy as they are putting more back pressure on the TP seal which is leaking it out.   Just a guess anyway!

Modifications / Re: PCP airgun design
« on: December 29, 2018, 10:30:08 PM »
Either way there still needs to be a volume of air between the one way bottle valve (if it has one) and the valve face which would be considered the "plenum". The general rule is that you will need 1cc of volume in that space for each fpe you are wanting to get.

Modifications / Re: PCP airgun design
« on: December 29, 2018, 03:11:28 PM »
I think the tube would be a much better way to go, make sure your ID matches an easily available reg from Huma in case you choose to regulate it in the future.

Modifications / Re: PCP airgun design
« on: December 29, 2018, 08:06:44 AM »
Ahhh right sorry I didnt click to what you were getting at, you are asking about using a bottle without having a reg on it? That would mean it cant be removed from the rifle while being pressurized and it couldnt be swapped to another bottle under pressure in the field. The inside neck thread on most bottles is M18 so by the time you have a male thread inside that your "bottle neck" is probably going to be 8mm or less which might end up being restrictive to the flow through the valve, it would probably perform better with a plenum space to feed from.

Modifications / Re: PCP airgun design
« on: December 28, 2018, 10:47:46 PM »
Yes you will need a plenum between the regulator and the firing valve, the general rule is 1cc per fpe you are chasing but that also depends on caliber etc too. Generally the plenum is a solid piece that the reg screws into and it then screws into the other half of the valve, the valve spring is usually seated against the end of it.

In an unregulated rifle the whole tube in front of the valve is effectively the plenum, some unregulated rifles use a pot infront of the valve that sort of regulates (just by having a very small hole in it) the amount of air that the valve has available to use which can help to flatten out the shot curve.

On specific info and your engineering questions you will need to speak to Wingman.

For Sale, Wanted, Spotted / Wanted - Gamo G1200 Co2 rifle
« on: December 20, 2018, 03:39:08 PM »
Let me know if you have one to part with, any condition is fine as I will strip and tinker with it anyway.


Hunting / Re: Summer plinking
« on: December 20, 2018, 03:37:32 PM »
Would love to grab a G1200 to tinker with, let me know if you see another one for sale Mike. Need to get those pellets off to you too!

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