The “Mongoose” strikes… HW 80 -.22 -20ft lbs
- By A.G.R
- Traditional Airguns
- 35 Replies
Ok, I’ve finished the HW 80 hunter I built (I’ll checker it after a month of drying) . I wanted to keep it stock strokes to try to see what it’s about..
( I’m working on a stroked version as I feel 5 mm more and it might be the best gun there is at it’s power, and stroke to cylinder ratio..more when that is further tested) It is a gun that’s built as good as it gets. When HW changed them front welded brackets witlh a spring loaded machined one that holds the arm tight at battery cocked. Along with the new cocking shoe. There IS NO AIR RIFLE that is as well built . Now it can benefit from some work as I have done. The factory seals are always parachute to support the guaranteed idiocy of the average shooter .
Remember, they are selling to mom and pop for jr. too. Not this type of airgunner.
This Mongoose has been reshapped in the breech block to match the chamber and sight screw holes filled with screws. I’ve welded them ,but you end up with heat transfer lines. I don’t mind the hairline screw lines . The best are the K breech blocks with none. The barrel was shortened to 11 inches. It has been recrowned and mildly choked with a full length shroud and … well it’s not empty in there.
I did do a slight bit of port shaping. Along with a new piston seal I made. (most Hw are tad smaller than 30 mm, 29.89.actually)
The spring is a smaller wire. .135… WHAT YOU SAY.. All them kit makers use .142 to .148 wire In their kits… It is easy to get a stout wire short stacked and tight wound to give a snappy cycle .. At THE COST OF YOUR ARM . Sadly the HW80 has a odd breech block to cocking arm ratio. It’s just out of what I refer to “the golden ratio” [I’ll post on that later, something I’ve found with the best guns for ease of cocking to power ratio. To breech block to arm ratio, THATS WHERE THE EXTRA 5 mm stroke will come into play]
The piston was carbonitrated,At the rear.. buttons are one way to center the piston . You need to indicate it and center the rod and re pin it with slip fit guide and it can’t move. The spring and guide are my own Designs.
The action and barrel have been bead blasted and reblued to a satin finish. It is a hunting weapon
The stock, yes ,I saved that for last.. it is a Venom inspired design from a local tree that was cut 25 years ago.. Its not my fanciest wood but sentimental , Yes.. it is a functional hunter stock. Albeit the front screws look like every Tx ,they are not. They are pillared with metal sleeves just under the wood to let the screws go flush while the metal braces against the machined brackets. (You could never get away with that ,with the welded brackets , they all stripped and you were re tapping and using cups in the stock) I prefer less outside,especially flush, to see the wood not brass rings or stainless steel
It’s shooting 14.66 ftt at 780 fps just a hair under 20 ft lbs with very little recoil. YOU WILL ALWAYS HAVE SOME,in a spring gun as it’s physics.. You can’t beat it. With the lighter spring cocking isn’t arm breaking like big wire. Trigger is ,well ,Rekord. 1 lb .
One thing I will be doing in the ne’er future is welcoming full open build specs as well as as much help as I can to those who want to try these builds on their own. I’ll tell you EVERYTHING IVE DONE. Remember, I can give you grandmas cookie recipe, not sure they will taste like hers..
I do not do this for any business or money as a tuning so called master or for profit. Been der done dat. Not worth it
Manny may be offended as they call balk and be offended because they think their knowledge s value, when in reality it’s fruitless . First ,it turns the many younger potential AIRGUNNERS away as they can’t afford these lustful guns. Give them hope and a bit of encouragement and we grow new AIRGUNNERS for the future of the sport..
Second, knowledge Is power, but what is knowledge if it’s not passed on..
Third, there is no money in truly tuning air rifles, the time spent on one gun that gives you fits can tie up a week worth of work.
TO THE GUYS WHO CAN MAKE $ kit dropping and de buring with new seals for $300 go for it..
( I’m working on a stroked version as I feel 5 mm more and it might be the best gun there is at it’s power, and stroke to cylinder ratio..more when that is further tested) It is a gun that’s built as good as it gets. When HW changed them front welded brackets witlh a spring loaded machined one that holds the arm tight at battery cocked. Along with the new cocking shoe. There IS NO AIR RIFLE that is as well built . Now it can benefit from some work as I have done. The factory seals are always parachute to support the guaranteed idiocy of the average shooter .
Remember, they are selling to mom and pop for jr. too. Not this type of airgunner.
This Mongoose has been reshapped in the breech block to match the chamber and sight screw holes filled with screws. I’ve welded them ,but you end up with heat transfer lines. I don’t mind the hairline screw lines . The best are the K breech blocks with none. The barrel was shortened to 11 inches. It has been recrowned and mildly choked with a full length shroud and … well it’s not empty in there.
I did do a slight bit of port shaping. Along with a new piston seal I made. (most Hw are tad smaller than 30 mm, 29.89.actually)
The spring is a smaller wire. .135… WHAT YOU SAY.. All them kit makers use .142 to .148 wire In their kits… It is easy to get a stout wire short stacked and tight wound to give a snappy cycle .. At THE COST OF YOUR ARM . Sadly the HW80 has a odd breech block to cocking arm ratio. It’s just out of what I refer to “the golden ratio” [I’ll post on that later, something I’ve found with the best guns for ease of cocking to power ratio. To breech block to arm ratio, THATS WHERE THE EXTRA 5 mm stroke will come into play]
The piston was carbonitrated,At the rear.. buttons are one way to center the piston . You need to indicate it and center the rod and re pin it with slip fit guide and it can’t move. The spring and guide are my own Designs.
The action and barrel have been bead blasted and reblued to a satin finish. It is a hunting weapon
The stock, yes ,I saved that for last.. it is a Venom inspired design from a local tree that was cut 25 years ago.. Its not my fanciest wood but sentimental , Yes.. it is a functional hunter stock. Albeit the front screws look like every Tx ,they are not. They are pillared with metal sleeves just under the wood to let the screws go flush while the metal braces against the machined brackets. (You could never get away with that ,with the welded brackets , they all stripped and you were re tapping and using cups in the stock) I prefer less outside,especially flush, to see the wood not brass rings or stainless steel
It’s shooting 14.66 ftt at 780 fps just a hair under 20 ft lbs with very little recoil. YOU WILL ALWAYS HAVE SOME,in a spring gun as it’s physics.. You can’t beat it. With the lighter spring cocking isn’t arm breaking like big wire. Trigger is ,well ,Rekord. 1 lb .
One thing I will be doing in the ne’er future is welcoming full open build specs as well as as much help as I can to those who want to try these builds on their own. I’ll tell you EVERYTHING IVE DONE. Remember, I can give you grandmas cookie recipe, not sure they will taste like hers..
I do not do this for any business or money as a tuning so called master or for profit. Been der done dat. Not worth it
Manny may be offended as they call balk and be offended because they think their knowledge s value, when in reality it’s fruitless . First ,it turns the many younger potential AIRGUNNERS away as they can’t afford these lustful guns. Give them hope and a bit of encouragement and we grow new AIRGUNNERS for the future of the sport..
Second, knowledge Is power, but what is knowledge if it’s not passed on..
Third, there is no money in truly tuning air rifles, the time spent on one gun that gives you fits can tie up a week worth of work.
TO THE GUYS WHO CAN MAKE $ kit dropping and de buring with new seals for $300 go for it..
