Author Topic: Weird PP700 stuff (Read 9352 times))

SilentMatt · « **Reply #80 on:** March 06, 2020, 05:54:54 PM »

Bottom of reply #14. Mine was a .22, so it had like .015 between the bore and threads in the breech. I'm pretty sure I bored the breech out to fit the barrel, and I use set screws on both sides of the barrel to retain the tension system without the breech nut. I turned the barrel down at the very end for the o-ring.

YEMX · « **Reply #81 on:** March 06, 2020, 06:21:04 PM »

Quote from: SilentMatt on March 06, 2020, 05:54:54 PM

Bottom of reply #14...

How did I miss that?!

Hmmm... bore the receiver out to .4375"... That might actually work... I'd still have to figure out a filler piece for the rear though, but that shouldn't be very hard. I could probably use Delrin or something... Hmmm... SilentMatt, did you have any issues pop up from boring out the receiver for a larger barrel? Did you do any other mods? Better yet, do you have a thread of your build, or are your mods in that huge PP700 thread?

SilentMatt · « **Reply #82 on:** March 07, 2020, 11:51:33 AM »

No issues, it's been my most reliable gun. I copied Donny's valve and machined a Delrin stock for it, but that's it. Not sure I posted anything on the barrel swap, they'd be in the huge thread if I did.
I might have time to pull it apart, have to replace the fill port o-ring anyway.

YEMX · « **Reply #83 on:** March 07, 2020, 01:23:34 PM »

Quote from: SilentMatt on March 07, 2020, 11:51:33 AM

No issues, it's been my most reliable gun. I copied Donny's valve and machined a Delrin stock for it, but that's it. Not sure I posted anything on the barrel swap, they'd be in the huge thread if I did.
I might have time to pull it apart, have to replace the fill port o-ring anyway.

Well, if you haven't had any problems with it so far, I think I'll do the same. .4375" isn't quite the full OD of #7. So there will still be a lip, which is fine by me... It'll give me more surface to glue in a spacer... Nice...

Finally starting to finalize all the mods and such. One step closer to sending this stuff off to the machinist. Here's to hoping I get my barrel on Monday or Tuesday. UPS is playing games

SilentMatt · « **Reply #84 on:** March 07, 2020, 02:18:49 PM »

Just pulled it apart and saw that I did bore the breech. I installed two set screws on the top as well. If you use a 12mm OD x 1.5mm thick o-ring, you can just turn a small step in the end of the barrel and you don't need a nut or spacer for the rear. The bore where the factory nut went stays untouched.

Rick67 · « **Reply #85 on:** March 07, 2020, 02:21:44 PM »

Quote from: SilentMatt on March 07, 2020, 02:18:49 PM

Just pulled it apart and saw that I did bore the breech. I installed two set screws on the top as well. If you use a 12mm OD x 1.5mm thick o-ring, you can just turn a small step in the end of the barrel and you don't need a nut or spacer for the rear. The bore where the factory nut went stays untouched.

Are you the same erstwhile Mr. Matt employee of JSAR, Mr. Matt?

If you are, it is good to see you have not left the airgun world yet, sir

YEMX · « **Reply #86 on:** March 07, 2020, 02:38:31 PM »

Quote from: SilentMatt on March 07, 2020, 02:18:49 PM

Just pulled it apart and saw that I did bore the breech. I installed two set screws on the top as well. If you use a 12mm OD x 1.5mm thick o-ring, you can just turn a small step in the end of the barrel and you don't need a nut or spacer for the rear. The bore where the factory nut went stays untouched.

Hmmmm... Interesting! Thank you!

SilentMatt · « **Reply #87 on:** March 07, 2020, 07:48:53 PM »

Quote from: YEMX on March 07, 2020, 02:38:31 PM

Hmmmm... Interesting! Thank you!

No problem!

Quote from: Rick67 on March 07, 2020, 02:21:44 PM

Are you the same erstwhile Mr. Matt employee of JSAR, Mr. Matt?

If you are, it is good to see you have not left the airgun world yet, sir

Thanks Richard. Even though I left JSAR, I'll always at least be shooting airguns.

YEMX · « **Reply #88 on:** March 16, 2020, 11:41:35 PM »

No real updates... I received my used .20 barrel and promptly went to work prepping it to send to the machinist. I was able to salvage nearly 19" of barrel! With some cursory "measurements" (read: I sorta assembled the receiver, old reg housing, Huma reg, and bottle adapter/bottle), it looks like everything will clear perfectly! I'll take a pic of the "sorta assembled" gun tomorrow. Barrel will for sure need to be cleaned up due to my ham hands

but I'll let the machinist handle that.

YEMX · « **Reply #89 on:** March 18, 2020, 12:09:05 PM »

Again, no real update. Just wanted to share a pic of the overall shape/feel of the build thus far. Tomorrow I'll sit down and really do some measurements so I can FINALLY get these parts off to the machinist. I've also got some CF tube on the way for a new shroud. The new shroud will obviously need to be longer, but I'll be able to re-use the front end cap from the JSAR CF shroud kit. It'll need a new rear end cap due to the larger OD barrel.

YEMX · « **Reply #90 on:** March 18, 2020, 12:20:14 PM »

Quote from: SilentMatt on March 07, 2020, 02:18:49 PM

Just pulled it apart and saw that I did bore the breech. I installed two set screws on the top as well. If you use a 12mm OD x 1.5mm thick o-ring, you can just turn a small step in the end of the barrel and you don't need a nut or spacer for the rear. The bore where the factory nut went stays untouched.

Just to make sure- Could/Should I just copy the step from the original nut (PN 7)?

mackeral5 · « **Reply #91 on:** March 18, 2020, 12:59:26 PM »

That's going to be sweet compact takedown gun. 5mm is a caliber I've never owned, always was infatuated with it, thanks to being exposed to Sheridan's old cylindrical pellets as a kid.

YEMX · « **Reply #92 on:** March 18, 2020, 01:38:20 PM »

Same. I keep reading about stories of .20 caliber accuracy and have been envious. I have an old Racine .20 'Dan that I will eventually send to Mac1, as soon as I figure out how to mount a front globe sight... I'll probably make a brass dovetail base for Tim to solder on while he does the Steroid build...

I'm still thinking on the take-down part, though I'm leaning very strongly towards that Air Arms TDR design...

KnifeMaker · « **Reply #93 on:** March 19, 2020, 02:13:02 AM »

Following!

Knife

YEMX · « **Reply #94 on:** March 19, 2020, 12:36:50 PM »

Not really an update- this is the Dr. Bob tank bipod mount. It's just a strap with a bipod stud. I'm using a clone Harris on this build.

YEMX · « **Reply #95 on:** March 21, 2020, 01:35:18 PM »

Okay- I've narrowed down some stuff:

4.25" OAL main tube.
14" OAL barrel

This main tube length is as short as I feel comfortable, as it gives some room to adjust the reg down the road, and gives ample clearance between the front of the reg and the end of the bottle conversion block.

A 14" barrel is darn near flush with the end of the bottle, and will be a touch longer, due to the LDC mount/tension nut. Which is fine- this way, the LDC will clear the bottle with no issue.

I'm going to finalize some other measurements today, and take some more pictures for the machinist and hopefully get these parts off for modification. I'll definitely have to get in touch to see if he's even accepting work right now, with everything going on.

Jzizzle · « **Reply #96 on:** May 05, 2020, 11:38:14 AM »

Sir,

Are you still working on this project?

YEMX · « **Reply #97 on:** May 05, 2020, 02:55:46 PM »

Quote from: Jzizzle on May 05, 2020, 11:38:14 AM

Sir,

Are you still working on this project?

I am, but I'm going down a slightly different path- Instead of the bottle, I'm just doing a slightly longer tube and it's going to be a normal carbine. The tube will use an Mrod-type fill plug and dust cap. Everything else will be the same.

Jzizzle · « **Reply #98 on:** May 05, 2020, 03:12:12 PM »

cool..looking forward to your finished build. Bigger reservoir with more plenum along with longer barrel should give a nice bump in power.

YEMX · « **Reply #99 on:** May 05, 2020, 05:23:03 PM »

I'm still keeping the power relatively low- 12-15 fpe... Not sure how long the reservoir is going to be yet either... But I think it'll still turn out to be a sweet shooter!

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Weird PP700 stuff

Author Topic: Weird PP700 stuff (Read 9352 times))