Author Topic: When is it no longer a Marauder ? ..... Lets get exotic & create a Sleeper ! (Read 2583 times))

Motorhead · « **on:** February 12, 2020, 05:21:05 PM »

This was a fun project that has been in the works for well over 2+ years now.

After recently having a gracious GTA member do the final machining on the main air tube, all the parts and pieces stashed away could get assembled. Into the mix some modern Tech as well making for a rifle that LOOKS LIKE an M-rod but ONLY used 3 OEM parts

Those being a partial & re-machined steel Air tube, Trigger group and Stock. EVERY OTHER PART is something custom or one off exotic / prototype.

Inside this beast sits one of my custom balance valves ( actually this one ) with the reversed thimble & external spring. Transfer port is a TAPERED design reducing the output end for increased throat back pressure and faster poppet closing. * tested & proven effective in a previous thread.

Hammer is a buffer type of my own design having an adjustable peek striker thrown at the valve via an External SSG devise where screw protrudes out the back of adjuster when cocked.

Air tube at a length providing @ 80 cc of plenum then a WAR drop block. 500cc 3K aluminum tank with a prototype adjustable output regulator provides the required HPA.

Up on the upper receiver sits a JSAR side lever breech with a full length @ 23.7" LW Poly barrel in .25 caliber. Custom shroud, end cap screwing on placing the assembly into tension being Super stiff and no wiggle !

Stock was cut out as needed for the regulator and kept long on the right side, shortened on the left for gauge & adjustment access. All done painted in Rustoleum textured along with shroud tube.

There the build in condensed format ... performance data to follow

Scott S

bear air · « **Reply #1 on:** February 12, 2020, 05:30:22 PM »

Oh Boy Scott that's my type of Marauder! Can't wait to see how it shoots and all the data. Very, very awesome.

Motorhead · « **Reply #2 on:** February 12, 2020, 06:08:27 PM »

Performance wise it took a bit of trial & error in getting the hammer strike correct in not only stroke but hammer weight. The buffering aspect of hammer while not active keeps the valve lift in check providing a few more shots off reg without valve over dwelling. Total hammer weight @ 37 grams and stroke @ 3/16" less than OEM spec maximum.
This rifle was conceived and set up to be a Pellet shooter leaving the slug duty to my WarP .22 ( Another thread ) In my extensive testing with the LW Poly not only were JSB 25.4 Kings happy at +/- 1000 fps from it, the Benjamin 28 grains were too at 960/970 with JSB 34's trucking along in the upper 800's. This on 2000 psi set pressure leaving me with 1000 psi to play with on the 500cc tank.

Here is where rubber meets and road sort of speak .... Having a very blended array or technologies many of us have seen these past couple years, some fortunate to work with

has been married into this build with the results being pretty darn astounding IMO.

As you see the gun with the spec parts mentioned, shooting the Benjamin 28 grain dome pellet at @ 960/970 fps guns cruising along at an easy 58 ft-lbs. Accuracy at 80 yards is inside a QUARTER coins group if I'm doing my part. ( not going to share groups or entertain such look at this silliness )
Last full tank string of shots taken started at 3000 psi and after @ 62 shots both gauges were at 2K and just showing movement lower. * So were seeing 62 shots on 1000 psi off a 500cc bottle.

The numbers using Lloyds calculator has it at: avg FPE/cuin per shot 1.72 with avg PSI used per shot 16

Damnnnn I'll take that too the bank any day, any where !!

As too if or not there is more power available

.... ABSOLUTELY being just a matter of pressure increases and adjusting hammer strike to match.
Well now I know I've built a worthy platform that with a barrel swap to unchoked could, would be an AWESOME slugger ... or just leave it be as the SLEEPER it appears to be

Thanks for following along,
Scott S

dan_house · « **Reply #3 on:** February 12, 2020, 06:13:27 PM »

yer killing me......

PakProtector · « **Reply #4 on:** February 12, 2020, 08:10:15 PM »

I do love those LW polygon barrels. And bottle marauders...

next up is a hot 30 cal pellet shooter; the one in 44" twist, 3-groove should be ready shortly.

Try putting a screw in the mag well to tie down the middle of the breech to the air tube. The pressure of the firing pulse tries to bend the breech into a banana. Thread the tube, and clearance the valve just a wee bit.
cheers,
Douglas

YEMX · « **Reply #5 on:** February 12, 2020, 08:18:39 PM »

Most excellent build!!!

Motorhead · « **Reply #6 on:** February 12, 2020, 08:28:23 PM »

Quote from: PakProtector on February 12, 2020, 08:10:15 PM

Try putting a screw in the mag well to tie down the middle of the breech to the air tube. The pressure of the firing pulse tries to bend the breech into a banana. Thread the tube, and clearance the valve just a wee bit.
cheers,
Douglas

Beauty of the JSAR breech is it is @ 1/4"+ taller with the extra material thickening the web under the mag slot where the bend could happen

OEM M-rods have a 7/8" shroud and my gun as shown is sporting a 1" and still has @1/8" gap between it and air tube. * Much beefier breech.

Good point tho for a stock breech big HP .30 cal for sure !!

Xraycer · « **Reply #7 on:** February 12, 2020, 08:35:32 PM »

Motorauder

PakProtector · « **Reply #8 on:** February 12, 2020, 08:40:52 PM »

Examine a close-up of the Raptor...it has just such a screw...

cheers,
Douglas

Motorhead · « **Reply #9 on:** February 12, 2020, 08:54:14 PM »

Quote from: PakProtector on February 12, 2020, 08:40:52 PM

Examine a close-up of the Raptor...it has just such a screw...
cheers,
Douglas

Indeed ... made note of such while assembling them for JSAR.
good mod indeed, tho IMO more needed with a Rapor than a M-rod due to there use of small fine thread pitch screws

hpmr2400 · « **Reply #10 on:** February 12, 2020, 10:04:42 PM »

Wow. I wonder what shot count would be if you lowered Kings to 880-900?

anti-squirrel · « **Reply #11 on:** February 12, 2020, 10:37:42 PM »

Quote from: hpmr2400 on February 12, 2020, 10:04:42 PM

Wow. I wonder what shot count would be if you lowered Kings to 880-900?

LOTS.

Scott, one impressive build. Seeing all the new tech in such a platform and delivering it at such an efficiency level is just mindblowing.

So the next step: monetize and provide a Motorauder build kit

ranchibi · « **Reply #12 on:** February 12, 2020, 10:46:55 PM »

Scott, wonderful build! You sure have the talent and knowledge to put that together 👍.

lloyd-ss · « **Reply #13 on:** February 13, 2020, 11:00:46 AM »

Scott,
Looks like it was worth a 2 year effort. You certainly can't buy anything like that. Performance sounds super.
I did have a little chuckle when you said in the first post that it only has 3 OEM parts. Some people might say that is a sign of an obsessed sick mind, but I call it creativity!

PakProtector · « **Reply #14 on:** February 13, 2020, 12:21:12 PM »

Quote from: lloyd-ss on February 13, 2020, 11:00:46 AM

Scott,
Looks like it was worth a 2 year effort. You certainly can't buy anything like that. Performance sounds super.
I did have a little chuckle when you said in the first post that it only has 3 OEM parts. Some people might say that is a sign of an obsessed sick mind, but I call it creativity!

I suspect it is more; there are more than three pieces in a trigger group.
cheers,
Douglas

Motorhead · « **Reply #15 on:** February 13, 2020, 12:34:45 PM »

Quote from: PakProtector on February 13, 2020, 12:21:12 PM

Quote from: lloyd-ss on February 13, 2020, 11:00:46 AM
Scott,
Looks like it was worth a 2 year effort. You certainly can't buy anything like that. Performance sounds super.
I did have a little chuckle when you said in the first post that it only has 3 OEM parts. Some people might say that is a sign of an obsessed sick mind, but I call it creativity!

I suspect it is more; there are more than three pieces in a trigger group.
cheers,
Douglas

Lol ... seriously you buy it as an assembly and it attaches as such.
But if you wish to be nit-picky so be it.

Douglas your too much

PCPhack · « **Reply #16 on:** February 13, 2020, 01:26:32 PM »

Reminds me of my Brod, where the only factory part at all is the trigger group. It's not really a Marauder at all at that point is it?

Nice work!

triggertreat · « **Reply #17 on:** February 13, 2020, 01:40:35 PM »

Quote from: Xraycer on February 12, 2020, 08:35:32 PM

Motorauder

Lol. +1 the man, the legend. Finally a correctly built Marauder.

T3PRanch · « **Reply #18 on:** February 13, 2020, 01:58:42 PM »

I REALLY like the Tan Rustoleum Bed Liner paint job!

Jr007 · « **Reply #19 on:** February 13, 2020, 02:05:46 PM »

Big Thumbs Up...Your The Man

Thank you to our advertisers!

When is it no longer a Marauder ? ..... Lets get exotic & create a Sleeper !

Author Topic: When is it no longer a Marauder ? ..... Lets get exotic & create a Sleeper ! (Read 2583 times))