.177 - 11.5" Daisy barrel P-17

[Back_Roads]

 I was going to add a link of where to get the featureless grip, but everywhere I looked they were sold out, even 2nd hand 
https://www.vcdefense.com/hammerhead-featureless-grip/


 Well I guess I have hijacked my original thread long enough so I may just divert my attention back to the 11.5 " barreled pistol for tomorrow, that and who knows what else LOL

[Rob M]

primary reason for the loss in FPS after about 10 inches is that the tiny shot volume is not enough to push past the added friction in a longer barrel.. the tipping point , is somewhere in the 10-12 inch range.

[Back_Roads]

primary reason for the loss in FPS after about 10 inches is that the tiny shot volume is not enough to push past the added friction in a longer barrel.. the tipping point , is somewhere in the 10-12 inch range.

 On the long barrel sniper, I am not taking in a full piston of air also, I was thinking about increasing the throw, but I am liking the reduced closing force ATM, But you are right about being over max barrel length, and the 11.5" barreled one is smoking close to 500 FPS and possibly faster with the right pellet.
 I will be doing some with that today, as I have not gone much past initial build testing yet.

[lillysdad621]

you have inspired me... time to re barrel my p17... 12 in will do... 480 fps with 7.9 is my goal to make a SSP hunter...then ill figure out a stock solution...

[Back_Roads]

 Happy to enable
 They sure are an adaptable product, the stock on mine surprisingly is held on with a stainless self tapping screw run into the back of the grip, the plastic used is quite strong, at first I thought I would have to use a blind nut "or is that squirrel" to make a solid attachment, in time it may.

[ray1377]

It is a snug fit pushing and turning from the front of the gun inward and one has to keep things aligned as one pushes and turns, at times i had to tap the barrel with a plastic mallet, the barrel lines right up to the exhaust port oring, I do polish the breach end to prevent o-ring damage, and slip a couple faucet washers drilled out to fit snug on the barrel to ensure a good seal, and I actually shim under the bridge clamp with a small oring or innertube like rubber to hold barrel firmer.
 I will get some better photos and assembly tips by this weekend, I have just started another P-17 project tonight, darn things are addicting. 

Mr. James
when you say the 880 barrel is a "good fit" for the P17 are you saying you DID NOT have to remove any plastic at the front of the gun to get the barrel to
fit up in the end? Also did you sand on the outside of the barrel any or did it just fit perfect by tapping it in there? Do you remember or could you measure the
O.D. of your 880 barrel?
Reason I ask is I have an older benjamin legacy pump gun that's built like a 2100 and was wondering if the barrel from it would work in my P17
without a lot of grinding

Thanks
Ray

[Rob M]

It is a snug fit pushing and turning from the front of the gun inward and one has to keep things aligned as one pushes and turns, at times i had to tap the barrel with a plastic mallet, the barrel lines right up to the exhaust port oring, I do polish the breach end to prevent o-ring damage, and slip a couple faucet washers drilled out to fit snug on the barrel to ensure a good seal, and I actually shim under the bridge clamp with a small oring or innertube like rubber to hold barrel firmer.
 I will get some better photos and assembly tips by this weekend, I have just started another P-17 project tonight, darn things are addicting. 

Mr. James
when you say the 880 barrel is a "good fit" for the P17 are you saying you DID NOT have to remove any plastic at the front of the gun to get the barrel to
fit up in the end? Also did you sand on the outside of the barrel any or did it just fit perfect by tapping it in there? Do you remember or could you measure the
O.D. of your 880 barrel?
Reason I ask is I have an older benjamin legacy pump gun that's built like a 2100 and was wondering if the barrel from it would work in my P17
without a lot of grinding

Thanks
Ray

the 880 barrel is actually an almost perfect fit for that front p-17 hole where the barrel steps down. theyre within a few thou of each other.same goes for the 1077 barrel , and likely a few others.

[ray1377]

It is a snug fit pushing and turning from the front of the gun inward and one has to keep things aligned as one pushes and turns, at times i had to tap the barrel with a plastic mallet, the barrel lines right up to the exhaust port oring, I do polish the breach end to prevent o-ring damage, and slip a couple faucet washers drilled out to fit snug on the barrel to ensure a good seal, and I actually shim under the bridge clamp with a small oring or innertube like rubber to hold barrel firmer.
 I will get some better photos and assembly tips by this weekend, I have just started another P-17 project tonight, darn things are addicting. 

Mr. James
when you say the 880 barrel is a "good fit" for the P17 are you saying you DID NOT have to remove any plastic at the front of the gun to get the barrel to
fit up in the end? Also did you sand on the outside of the barrel any or did it just fit perfect by tapping it in there? Do you remember or could you measure the
O.D. of your 880 barrel?
Reason I ask is I have an older benjamin legacy pump gun that's built like a 2100 and was wondering if the barrel from it would work in my P17
without a lot of grinding

Thanks
Ray

the 880 barrel is actually an almost perfect fit for that front p-17 hole where the barrel steps down. theyre within a few thou of each other.same goes for the 1077 barrel , and likely a few others.

Well you boys give me a hour or so and I'll let you know if the Legacy multi-pump .177 barrel is a good fit
I'm not 100% but I'd be willing to bet its the same as a 2100 barrel.
So you are all in agreement that 10 to 12 inches is the maximum allowed length before performance starts to suffer?


Ray

[Back_Roads]

 Guess I'm reading slow lately, just found the post, the daisy 880 barrel is .298 OD give or take a fraction for cheap calipers. As far as fitting i just pushed while turning and lightly wiggling the barrel and it makes a darn snug fit, if it seems not to go one could take a drill bit in that size and hand turn it to open it up but I have not had to do that as of yet.
 11.5 " allowed the gun to fully cock without modding the grip or trigger guard, though under the gun there needs to be some plastic removed to allow full travel, where the barrel pivots.

[ray1377]

Well I bit the bullet and went ahead with the new barrel install. Total length of new barrel is 11 1/4 inches from end to end. Still have about 1/8 of an inch before hitting the trigger guard when cocked. And NO the legacy barrel is not a direct fit. It measured .310 and the P17 barrel is like .273 at the smallest place, being the turned down part on the muzzle end that keeps the barrel from flopping around. After cutting my barrel to length and polishing the ends I had to drill out the hole for my barrel to go. No amount of twisting or hammering was gonna put a .310 barrel through a .273 hole
I got it in and had to adjust slightly for a good fit at the loading end by the exhaust port o-ring. But it's in there and doesn't hit the trigger guard when fully cocked.
Chrony readings coming soon.
Thanks
Ray

[Back_Roads]

  Waiting to see your results. I just tried some Beeman silver bear.177 11. some gr., in both my p-17s, just shooting cans but did not crono yet but they do leave deeper dents 

[EdinGa]

I just got an Xisico 120d from Mike. It's only doing 250 fps with the 22 barrel but it's plenty accurate. I've got a spare 2240 barrel laying around that might get stuffed in there.

[ray1377]

Okay finally found time to run some pellets over the chrony after the barrel swap.
Using the same 7.9g CPHP's I used with the original barrel.
Original barrel = 390 fps
New longer barrel = 414 fps
The new barrel seems to be tighter fitting using these pellets so may have to try a few
different others to see if FPS changes or accuracy changes as well.
Pleased with the results so far.

Thanks
Ray

[Back_Roads]

 Hmm yeah if the pellets seem too snug it may slow them down, also make sure you are not getting blow by on the breach seal.

[avator]

I've got a couple 2240 barrels around here. I may do some tinkering of my own.

[ray1377]

Hmm yeah if the pellets seem too snug it may slow them down, also make sure you are not getting blow by on the breach seal.

I thought of that. When I first got it back together and shot it a few times the upper side or top side of the breech seal seemed like it wanted to come out of its cutout each time I opened the gun. I thought at first it was the end of the barrel rubbing on it and trying to roll it out but now I'm thinking it may be blowby trying to push it out caused by the barrel not being snug enough up against it?
Didn't I read where you added a faucet washer or something to your barrel on the breech end to aid in sealing?

THanks
Ray

[Back_Roads]

 Yes I drilled out 2 tapered faucet washers to be a snug fit to the barrel, and fit up to the breach tp oring. on one I think I shimmed with a small oring first to make the faucet washer sit just proud of the breach end of the barrel, and only rubber to rubber contact with the tp oring . The wider surface of the washer also seems to help with pellet loading.
 Tip on keeping the barrel tight in the barrel clamp is a small piece of sandpaper to give it a gritty bite, or thin rubber like innertube works also.

[WhatUPSbox?]

James, Do you have a picture of the two washer and o-ring set-up?
Thanks

[Back_Roads]

James, Do you have a picture of the two washer and o-ring set-up?
Thanks

 I have my original idea pictured, just imaging that washer flipped tapered end facing the direction of pellet travel on both washers, oring in-between them may work as well also. you can see how I have the washer just past the end of the barrel.

[WhatUPSbox?]

Got it, Thanks