Beeman P17 and XSP 120D... Next level builds/mods.



Author Topic: Beeman P17 and XSP 120D... Next level builds/mods.  (Read 110246 times))

Offline stalwart

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Beeman P17 and XSP 120D... Next level builds/mods.
« on: June 26, 2013, 07:37:47 PM »
There are a few 17 builds in my near future, and some will be rather extreme. Started on one that will prove to be mild compared to later tries. Comments and suggestions are more than appreciated... and if anyone has done a mod that isn't already all over the net, you are welcome to post it here. Here goes...

Milled off the fake slide release and the sights in prep for a full length Picatinny rail, and cut a Marlin Micro Groove .22 barrel blank to 10 inches.
« Last Edit: November 24, 2013, 01:40:53 AM by stalwart »

Offline robert w

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Re: Beeman P17... Next level builds/mods.
« Reply #1 on: June 26, 2013, 09:28:15 PM »
keep on im listening opps watching . looks like your aiming for dime sized groups at 10 meters isn't you?
in 1939 hitler said give up your guns and germany will be a safer place... then a short time after all guns were taken ,he told the jews "board the train" a word in histroy

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #2 on: June 27, 2013, 01:02:10 AM »
Indeed.  ;D  And, when that gets too easy, I'll move back 10 more... and so on, I have 50M to run in.

Barrel extension is 11mm (7/16"), same as all the cool Crosman aftermarket stuff.
« Last Edit: June 27, 2013, 09:21:08 PM by stalwart »

Offline TleVta

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Re: Beeman P17... Next level builds/mods.
« Reply #3 on: June 27, 2013, 01:28:01 AM »
You're off to a very nice start. I like my P17 stock for the time being, but I'm gonna watch this one. Carry on, please.
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Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #4 on: June 27, 2013, 03:13:40 AM »
Thank you!

Appreciate the company, guys.

Takes a very firm push to get through the nose, then it snaps in place. I was prepared to place a set screw in the heavy party of the nose if I had to loosen it's tolerances (to reclaim them), but it won't need it. The plastic is quite firm. It's pretty good stuff... and as an avid RC guy, I have played with every kind China has come up with.

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #5 on: June 28, 2013, 08:04:20 AM »
It runs!  ;D

I'm happy. I put a sweet 2 stage trigger job in it, and ran a hundred through it. It's surprisingly quiet, and is no longer "recoil-less". It kicks a bit... kinda cool.

I really like that a 12.5" OAL gun can have a 10" barrel.

I took a bunch of pics of the trigger job. I'll try to explain it the best I can, but may need help making it all clear.

Next is the sight rail, and a big decision. I'm not a bling kinda guy, but given the choice of matte black powder coating the barrel and other shiny bits, or clear... I'm thinking the barrel does look sorta sexy with the contrast. What do you guys think?

 

Offline MartinDWhite

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Re: Beeman P17... Next level builds/mods.
« Reply #6 on: June 28, 2013, 10:04:47 AM »
What speed is a 22 pellet coming out of that P17?
Are you planning any power upgrades other than a longer barrel?

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #7 on: June 28, 2013, 10:16:10 AM »
LOL... as a matter of fact, I have the chrony set up, and am waiting for the battery to finish charging. Hard numbers (my favorite kind), very soon. The light is perfect.

Then, the port gets drilled out before another chrony run. The last thing this one gets is a piece of solder crushed in the tube, then measured to get the best thickness for an aluminum disc to glue to the piston head for max compression.
« Last Edit: June 28, 2013, 10:18:41 AM by stalwart »

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #8 on: June 28, 2013, 10:57:06 AM »
.22 CPHP (14.3gr) @ 335fps = 4FPE... Stocker runs .177  Copperheads (9.25gr) at 390FPS = 3FPE

Gun is 65mm longer, and gained a pound of juice. Not a bad trade?

Offline SnoValley

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Re: Beeman P17... Next level builds/mods.
« Reply #9 on: June 28, 2013, 12:07:28 PM »
.22 CPHP (14.3gr) @ 335fps = 4FPE... Stocker runs .177  Copperheads (9.25gr) at 390FPS = 3FPE

Gun is 65mm longer, and gained a pound of juice. Not a bad trade?
Nice numbers. Have you considered the Phil MSP mod?
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Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #10 on: June 28, 2013, 12:48:12 PM »
Yeah, I think it's a good start, too. Pretty happy, actually...

I don't plan to try MSP for a while. I have to build a detuned .177 for my girl, and then the sky's the limit.

Can you link me to dimensions on the MSP valve? It would be a perfect set up for a carbine I'm pondering.


Edit: Thanks! http://www.network54.com/Forum/275684/thread/1305736542/Beeman+P-17+multi-stroke+finished%21
« Last Edit: June 29, 2013, 02:06:23 AM by stalwart »

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #11 on: June 29, 2013, 07:26:36 AM »
Tried the set screw in the nose set up, and found it to be stout, and easy to adjust for breech clearances. Reshaped the barrel for it, and rail mount screw clearance. Caliber changes will be easy with this design.

This plastic is superb... it taps well, and resists cutting enough to allow methods and tools for soft aluminum to get precise results.

Squared off the top and side of "slide" (got most of the molding waves out), and cut the rail to fit.

Cut a recessed target (90*) muzzle, and cut the breech face to nearly match the dia of the o-ring and rounded outside it. I learned something while fitting the barrel... now that it's long enough to "sip" a vacuum inside it, I can check the seal. Turns out that the "slide" flexes just enough that when a vacuum will hold with the gun at rest, it doesn't necessarily hold when cocked. When fitted perfectly, if the breech face is sharply angled... it can shave the face off the ring. I'm sure a loose fit doesn't lose much air (not much time to), but I want this rig as consistent as possible. Works fine now, and feels very precise when closing.
« Last Edit: June 29, 2013, 08:20:35 AM by stalwart »

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #12 on: June 30, 2013, 04:59:39 AM »
Nearly done. Powder coating, then a bit of hotrodding left.

The rail, attached with three 4mm screws, makes a great backbone. It's all very rigid now. I ordered rail pads, but the rail alone beats the narrow, sharp upper. Quite comfy now, and I'm less concerned with high compression making the thing hard to take.

I like these, this is just the beginning...
« Last Edit: June 30, 2013, 10:20:12 AM by stalwart »

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #13 on: June 30, 2013, 02:25:48 PM »
Opened up the port to 4mm... gained just over 5fps. Not a lot, but tells me that raising the compression without porting would have left some gains negated by restriction.

It will be finished soon!  ;D

Just tested, and found there is .84mm of space left in the tube. Have no idea if that is enough to bother, but I'll know soon.
« Last Edit: June 30, 2013, 04:01:49 PM by stalwart »

Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #14 on: July 01, 2013, 03:52:34 AM »
 ;)
« Last Edit: January 10, 2014, 11:57:37 AM by stalwart »

Offline Slavia

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Re: Beeman P17... Next level builds/mods.
« Reply #15 on: July 01, 2013, 12:32:43 PM »
Good stuff all around.  I especially like your rail solution.  It's clean, strong, and versatile.  Also, I think you will like the feel of the hammer spur extensions.

If the weight of the barrel and scope change the balance too much you can easily add weight to the grip area.  I mixed a slurry of epoxy and BB's and dropped it into the vacant cavities of the plastic "honeycomb."  Spent pellets would work as well.
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Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #16 on: July 02, 2013, 12:45:19 AM »
Thanks.   ;D  I've been meaning to ask you... if you had another 17, what would you do to it?

I'm almost finished, and I'm already doing prelim measurements for a carbine. Your 1008 is inspiration. What does it weigh?

Took the molding lines off the frame, and got the powder coating done. Went with Federal Standard 27038 matte black... it has a slight sheen I really like, and ages well. I'll do shiny some other time.

Offline TleVta

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Re: Beeman P17... Next level builds/mods.
« Reply #17 on: July 02, 2013, 12:52:17 AM »
Impressive work. How hard would it be to mount a weaver rail under the gun just like a Webly & Scott Alecto?
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Offline stalwart

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Re: Beeman P17... Next level builds/mods.
« Reply #18 on: July 02, 2013, 01:04:25 AM »
Appreciate the encouragement! This stuff is so much more fun when you can show it off, to folks who get it.

It would be a pretty straightforward mod. I measured it out, but won't be doing it to this one. I'm trying to keep this one simple... the temptation to add features is almost too much to resist!  ;)

There is plenty of meat along the bottom, to work with. A small flat spot with room for 2 mount screws is enough. I'll cut mine inset a bit, so the rail indexes... will look pretty clean.

What's your first mod going to be?

Offline TleVta

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Re: Beeman P17... Next level builds/mods.
« Reply #19 on: July 02, 2013, 01:31:58 AM »

What's your first mod going to be?

I put one of these on the dovetail:

http://www.pyramydair.com/s/a/BSA_Laser_Sight_With_MTS/288

But I didn't like it cluttering up the FO sights. If I could mount it under the gun somehow, I'd be pretty happy.
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