Surgeon CSR aka Surgeon CTSR aka Surgeon PSR aka Remington RACS
Before diving into it, some infos about those platforms :
CTSR : MK13 Mod5 Long action, 300Win mag
(it's almost like a XM2010, with surgeon stock basically)
CTR : Surgeon Action, and 7.62/308
CSR 2014 : Remington action, Short action, Multicaliber, RACS chassis
CSR 2012 : Surgeon Action 591 MR, Short action, RACS chassis
CSR/CTSR are mainly used by CAG/USASOC
You can either see AICS metal mags, or PMAG 7.62 polymer 10 rnds mags.
Lucas Botkin,Ex-CEO of T.REX Arms, is an owner of a Surgeon CSR/RACS.
https://www.youtube.com/watch?v=g-cXfSFIwQE
https://www.youtube.com/watch?v=fpi04163M_Q
Cris contacted me, because he was interested in a custom chassis for his TAC41.
His request was a chassis that the CAG is using since he do "US 1SFOD CAG reenactment".
The instagram of the group :
https://www.instagram.com/cag_alphateam?igsh=eWdvendmajJsMmls
CAG use CSR/CTSR, and Barret MRAD.
For those wondering, i've made a Barret MRAD TAC41 prototype during 2025, but never shown it before.... :
Cris loved it, but asked for a more slimmer and less "big boy type" of platform.
FInal decision is to make a 308 version of the Surgeon, so CSR/CTR.
This is what i'm going to replicate with markings.
I personnaly love those configurations, with Nightforce scope, Range Finder and Night vision scopes.
You can see he's also equipped with remington BRACS...
and ARCA rails addon...
This one got a longer upper rail also.
Since the TAC41 receiver is not accurate, i'm going to make a custom Action receiver accurate to the Surgeon.
Here is the first result after some hours of CAD :
(It use TAC41 cylinder group, trigger group, and 510mm outer barrel)
Handguard is Remington RAHG system.
It's same as MLOK, or Keymod, or Q-sert, but from Remington.
This sytem is also available on the Remington RSASS and others.
Some more CAD hours laters...
I design the Surgeon Stock, and AICS 308 mag wich is accurate to the real one model :
The mag are custom ofc, and not T41 specs.
It's a Midcap 30 rds, and use shotgun midcap cartridge for better feeding, and capacity inside a 3DP body.
Buttpad, buttplate, Cheekpad, side rail, and all the bits are also added :
Cheekpad and Buttpad are adjustable in height and length, using 2 M10 screws and wheels.
Buttpad is also adjustable in height.
The whole platform is designed like it's real counterpart, and is made to be assembled the same.
For the most curious among you, i've added the markings on the action receiver and on the rails.
"Scalpel", "Surgeon Rifle" and the logo on the left side, and the Caliber "308Win" and a Serial Number on the right side.
Instead of a Serial Number, i've writed "CSR.TAC41.B3D" as a signature of my work.
I didn't added the "model591/MR" markings.
Here is a preliminary render, with all the T41 parts, long barrel, action, and grip in the Brown'ish remington color.
Thanks to Flamingo Custom, for the chat about Cerakote and specifications.
Check him out here :
https://www.instagram.com/flamingocustom/
The tint that will match the color of the CSR is Burnt Bronze C-148
https://www.cerakoteeu.com/fr/produit/burnt-bronze-c-148/
(Not to be mixed with the RAL8000/H-8000 or the Barret Bronze H259)
In my opinion you can choose either RAL8000, BB C-148, FDE H-265, PB C-226 etc they are quite all similar...
Cool thing about the TAC41, you can swap between barrel length, 330mm, 420mm or 510mm.
So you can choose whatever you want... Short + silencer, or Mid + silencer or Long etc
Versatility's winning...
Speaking of silencer :
You can find 3 models that are used with the CSR.
Surefire 762
AAC Titan, Ranger, SDN6 or others
and TBAC Ultra 7
They can all be hided inside a silencer cover.
More CAD hours laters...
More and More CAD hours later...
You can see i've made the BRACS addon and a lots of bits..
And also the ARCA plate addon
I also took quite some time to figure out the small stock latch on the hinge...
Who is also working as a folded stock maintainer.
After some brains stunts, here is the result...
I can consider the chassis on the final stage of develloppement at this stage...
Now that the chassis is done, it can go on the printing, and testing phase...
While the chassis is currently being prototyped/printed, i've made some accessories, including the Range finder that the same unit uses along their bolt action
It's called the Envision Technology MARS/MARS-Lc
After quite some reseach, and a tunneling sessions in CAD, i've succesfully reproduced it :
It's available on my Cults3D :
https://cults3d.com/fr/mod%C3%A8le-3d/jeu/mars-dummy-airsoft-rangefinder-benen3d
It's going to be added to the Surgeon CSR parts build of course.
Action Receiver is printed
Raw printed markings are better than expected
Full Stock is done
Buttpad, and cheeklpad are adjustable
Stock is foldable, and locked by the latch
Along with the specific Surgeon color
Christmas 2025 :
Small part that help complete the clone build : the Reptilia ROF
Files are available on cults :
https://cults3d.com/en/3d-model/game/reptilia-rof-scope-mount
And this is how my personnal clone build went out :
Fully printed body kit
TAC41P internals
510mm outer barrel
BRACS
Victoptics scope
Reptilia ROF diving board replica
And the Envision Mars dummy i also did
https://cults3d.com/en/design-collections/BENen3D/range-finder-long-range-accessories
(I will probably swap it to a 330mm barrel in the future to have a 16" CSR).
16" barrel installed : it so cute !
That's a Wrap !
Thoses "wired" renders are specially made so you can see the complex geometry, and hope it will help you understand the amount of work needed for such accurate chassis/works...
And of course since it's made for 3Dprinting, it's optimized for this usage, but can also be made in CNC, for a way bigger cost.
And for those who thinks they have the right to criticize something they are completely uncapable of doing, i am still waiting for you to do such things in the same timeframe as i do them ;)