12fpe Avenger??

[Dairyboy]

Anyone tune an Avenger for low power? Today with reg dropped to 1000psi and hammer spring backed off all the way lowest I got was 740fps with it using a ton of air. I'm hoping for 650fps. Or around 15fpe in .22. I tried creating valve lock by raising the reg up incrementally and shooting over chrony. All the way up to 3000psi I got it to 800fps after it maxed around 2000psi around 870fps. With 16gr pellets. Guess at this point I'm gonna chop the hammer spring down.

 

[Muddydogs]

Why so low FPE?

 

[Tpatner412]

Stock, the gun will not go that low with any decent consistency over the chrony, if at all. Altering the hammer spring would be a good place to start for sure, and isn't too difficult. 

 

[Dairyboy]

Why? Why not? Lol. Some shooting situations need lower power guns like shooting in barns. Also close range pesting you don't need a hammer of a gun to shoot birds or squirrels.

Thanks for chiming in Tyler. You know the most on these guns having your hands in the design and what not. I tore it down to the hammer spring today and had it out in about 10 min. Haven't cut it yet but is a pretty stiff spring. Shouldn't need to cut a big amount off.

 

[Tpatner412]

You might consider getting another spring of equal length but thinner wire diameter versus cutting the stock one. Then again, if you don't plan on going back, I suppose it's not a big deal to cut it.

 

[Dairyboy]

Yeah that's not a bad idea. I'll take dimensions and see what I can find first before cutting anything 

 

[nervoustrig]

With any luck, you’ll end up with a shortened spring with no preload so as to help prevent hammer bounce. Otherwise I would be inclined to grind some weight off the hammer. If you can carry it far enough, the shot cycle becomes so pleasant, and likely help diminish the report enough to get frequent back-to-back opportunities.

 

[Dairyboy]

Man I am really struggling trying to find anything similar to original hammer spring. Here's the specs 

 

[Dairyboy]

Yeah Jason I think the original spring cutting down is best bet. I would like a spare though before I go at it. Quite difficult for me to find something similar.

 

[nervoustrig]

Man that’s a heavy wire at 0.055 for such a small OD. McMaster has one with 0.051 wire:

https://www.mcmaster.com/9657K427

 

[Dairyboy]

Thanks! I must not know how to find anything on McMaster as I couldn't find anything remotely close. But yeah crazy stiff little spring. I think cutting it would be good even with average powers.

 

[Texan357]

What kind of fpe does a Texan 357 make shooting 200grainers@1000 fps?is there a formula to tell?

 

[shambozzie]

That would be 444 fpe.

 

[Dairyboy]

Well I cut it .4" to leave it at 2". Dropped reg to 1000psi again. First shot backed out 500fps. Perfect. 3.5 turns in and I'm at a cool 640fps and seems to have a nice tight ES over 10 shots of less than 10. Super quiet and dead shot cycle. Sighted in at 20yds. Basically same hole definitely MOA of better. Should serve it's purpose very well now!

 

[marquette]

I’m also a fan of 12fpe guns. Usually quieter, less damage to targets and backstops. It will be interesting to see how long a stable shot string you are able to get combined with the Avengers array of adjustments 

 

[rmslim1]

I'm glad that you were able to figure this out. I was actually looking into doing the same thing to my avenger. I put a bottle on mine, so I figure that I should probably be able to shoot all night without refilling. I'll give it a whack next week, and I'll report back in a couple days.
Thank you for the information.

 

[Roachcreek]

Just saw this post, I have been shooting my Avenger at 10 yards and can only get it down to 780 with cheap Crosman hop’s.

Why 10 yards, I have a Prod and Skyhawks tuned to 10-12 fpe, I call them my Sheetrock guns because when the inevetable ldc clip occurs you can remove the pellet from your Sheetrock with your finger tips.

Cutting that spring will work great.

Roachcreek

 

[elh0102]

I know nothing about the Avenger, but I recommend that you try the lower power tuning. I have an HW100 in .177, I recently tuned it down to 11.5 fpe, shooting the 10 gr pellet a bit over 700 fps. Accuracy and ES remain stellar, and shot count is 160+, and that's with the short carbine cylinder. The stock hammer and spring worked fine for the lower power tuning, but it sounds like the Avenger may be set up to accommodate more, rather than less power. I find the lower power tuning to be perfect for yard shooting and pesting. It has more than adequate power for squirrels, since my maximum yard distance is around 35 yards.

 

[JimD]

McMaster also has a 9mm od stainless steel spring made with 1mm wire that is 59mm long. Seems like you found your solution but they have a lot of coil springs.

 

[Roachcreek]

I trimmed my hammer spring to 2.1, with no preload and bottomed out on the regulator it’s shooting Chp’s @ 500 fps. That’s right where I wanted it.

I had never removed the stock, but was curious as to why it is so accurate and why folks say it is a pos.

Trigger still sucks, still too much 2nd stage and to lighten it up to where it needs to be makes it rattle and flop around.

Which brings me to why folks say it is a piece of poop, it is more precisely a rattling hard to assemble I’ll fitting parts price of poop. A wood stock would help alleviate the rattling somewhat.

Still no clue as to why it shoots so well.

Roachcreek