Increasing Feet Per Second

 Concept 4 - Airgun Build  No Responses »
Jan 242013
 

Last year I completed the Buckley inspired rifle and I was hoping to get a chance to increase the feet per second (FPS) on the custom airgun. Earlier this week I set up my chrony and the resulting average was 716 fps with a .22, 14.3 Crosman Hollowpoint pellet.

Taking the gun apart I drilled all the 1/8″ air feed holes up to 3/16″. Resulting velocity increased to a three shot average of 749.

From there I removed the hammer spring and place a 1/4-20 hex nut behind it for a little more preload. Three shot averaged 796 FPS and highest was 805 FPS.

Energy produced prior was 16.4 fpe and 20.5 fpe with the changes. Hoping to increase the FPS to around 900 if feasible.

Calculating the changes with percentages it works out to 12.5 increase in velocity and a 25 percent increase in power!

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Given these results I worked out the power at 900 FPS would result in power of 25 fpe. So that will be the goal for spring.

Thanks for reading.

Concept 4 Airgun & Fishing

 Concept 4 - Airgun Build, Updates  No Responses »
Jul 052012
 

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Hello Everyone,

Hope everyone had an enjoyable July 1st in Canada & July 4rth in the USA. I finally went to my parent’s fishing cabin which they have had for 5 years. Went for one day with wife, sister in law and her son. I caught the monster northern pike shown, 38.5″ & 14 lbs!! Not bad for not having gone fishing in two years.

My dad caught a 34″ and 9 year old nephew caught a 29.5″. He caught 6 total and was very happy for his second time fishing.

I am working on editing a hundred plus pictures of the Concept 4 air rifle. I should have some additional pages set up next week and will post an update here when I do. Shoots very well, .22 cal at 730 FPS with 1400 psi regulator!

Thanks for visiting! ~ Pedro

Concept 4 More Progress

 Concept 4 - Airgun Build  Comments Off on Concept 4 More Progress
Nov 202010
 

Today I made the striker knob and the bolt knob. I was also able to start on the wood forearm stock. Starting to look like a real rifle. I forgot to get the aluminum to create the butt stock but didn’t have time regardless it was my dad’s birthday today so went their for supper.

I hope to do some shooting soon to see how this airgun performs.

Concept 4 – October & November Machining

 Concept 4 - Airgun Build  2 Responses »
Nov 182010
 

I have rifles almost complete minus the stock and wood.

I haven’t been able to finish all the page links but here are two new pages of pictures for the concept 4 rifle.

http://airgundevelopment.com/concept4pg6.html

http://airgundevelopment.com/concept4pg7.html

I hope to link all the pages soon. I have pictures from Schaefer on his new build and will post them soon. Thanks for reading.

Concept 4 – Buckley Design – First Shot !

 Concept 4 - Airgun Build, Updates  1 Response »
Nov 072010
 

After a very frustrating morning, I was finally able to get to the shop to work on the air rifles. I managed to get one of the rifles to fire by 8pm. On valve is leaking so have to work on that. Valves either work or leak and finding the perfect combination is tricky it seems. I realize now I should have made the valve a 2 piece design.

I worked on the triggers and sear. I had some springs but they are to weak and will have to get some heavier springs to make the trigger and sear engage more consistently.

Below is a video showing a few shots and first pellet shot. I will add to the web page when I can as I have many pictures to add from last 2 weeks of working on this project. The rubber bands are holding 1/8 drill bits in place to locate the trigger and sear and kept falling out otherwise.

Next few weeks will be focusing on the final machining and assembly as I can. Thus far a very mild fall here in Manitoba, but the snow and extreme cold are going to pounce on us very soon!

Comments, please feel to tell me what you think. Thanks for visiting the website. ~ Pedro

Concept 4 – Buckley inspired rifle

 Concept 4 - Airgun Build  Comments Off on Concept 4 – Buckley inspired rifle
Nov 042010
 

I have been able to do some work on the Buckley inspired reservoir airguns I am building. I have finished machining the valves, hammer and now need to make the triggers and sear. Hoping to have this completed on Saturday Nov 6th and should be able to test fire shortly there after. I will update the pages next week when I get a chance.

Modern Gun Stock

 Updates  Comments Off on Modern Gun Stock
Aug 262010
 

I cut out the profile of the gun stock for the modern rifle I made. The walnut is sure a lot harder to cut than regular wood. I am by no means a wood worker so working with hardwood will be interesting. Over the next few weeks will be shaping it along with hopefully continuing on the Concept4 when time allows.

Thanks for the emails and kind words some of you have said about the website. ~Pedro

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