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Precision shooting off a vehicle

Has anyone ever noticed any precision (or accuracy) issues when shooting prone off of a stationary vehicle? Such as prone out of the bed of a pick-up, or off a decent sized trailer? Does movement of the vehicle on the suspension come into play, or is there just too much weight for it to move in time to effect trajectory? I've used a platform on a trailer to get above weeds before, and everything seemed solid enough. I got a first round hit at 950 so I guess I can't say it caused any problems. But I've never tried to shoot groups off it for load development either.

Anyone ever see any issues?

My 427 blower motor project.

A few moments where I depreciate the value of my neighborhood. Living amongst senior citizens has its advantages during times like this, as most are deaf as a post.

The data log reveals some interesting stuff. Idle lands around 1050rpm once it warms up. A 0-100% throttle whack sends the RPM to over 3,800 in 400ths of a second. The impressive (or scary) part is that during the blip, the atmosphere inside the engine changes from 14" of vacuum to +11psi worth of boost. This one has some big lungs, lol.

Still lots to do, but it at least starts and moves now.

The dry sump oil pump belt alignment has a small tracking error that I'm still working on. I have a .025" shim on the pump mount now that seems to help. I might have to add a little more.

The next big problem to solve is power management. This is a small tire car, and I estimate the engine to land somewhere around 2k for power output. Putting all of that to a 10" wide radial tire is asking a lot. I am not a fan of 2-step rev limiting strategies on blower motors as it's hell on parts. The mass of a pair of rotors whirling around as they are rapidly +/- in rpm as the computer pulls/adds cylinders (ignition) is not a good thing. A friend who's much smarter than I am has a pretty clever alternative solution using a stock GM throttle-by-wire throttle body. I ordered a pair and am dissecting them now for the upcoming experimental transplant surgery.
If it works, the engine will no longer crackle and pop. It'll just increase rpm, hold, and accelerate off the line with smooth/linear progression. Add some peripherals (traction control), and we might have a good solution for how to launch/control this dumb thing.



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SOLD Manners Night Stalkers *updated*

Manners NIGHT STALKER
Rem 700 & Clones SHORT Action Inlet
Proof Sendero Barrel Channel Inlet
Micro Chassis (for M5 bottom metal)
2 Flush Cups Left Side

I did not place my order with the EFR as the majority of people I know use a thermal scope and not a clip-on. This can be purchased from Manners for $150 if you want to run a clip-on

$1600 shipped

1 - SOLD
2 - ELITE DISCO TOMMY BAHAMA
3 - SOLD

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SOLD

SOLD *SPF* Insight FDE ATPIAL-C $900 shipped

SOLD PENDING FUNDS

Hi guys,

Have a great condition ATPIAL-C for sale today. That's the civilian powered version of the PEQ-15.

Date code: 2015.

Has seen some moderate use during night shoots, but has never been abused and was always stored with the batteries out when not in use. Has some usage marks here and there but nothing serious and everything works as it should.

Does not come with the pouch, or manual.

What you see is what you get.

Price is $900 shipped via USPS Priority Mail, signature required.

If you think I’m smoking crack on the price, feel free to make a reasonable offer but I feel like this is priced pretty decently.

I accept Paypal F&F, Venmo F&F or Zelle with no mention of firearms / firearms parts whatsoever.

Not looking for any trades at the moment.

Please DM with any questions.

Thanks

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Accessories THE ORIGINAL MAGNETIC DOPE CARD HOLDER (SPUHR/Pic Rail/Arc M-Brace)

Picatinny mounted dope card holder. Each set comes with 2 erasable cards.
shipped with tracking.
color options are green, black, or purple.
I can accept PayPal, cashapp, Zelle.
Send me a message if you want a set.

Apply 30% off to all products with the promo code "July4%30OFF".

Shop | DAC Solutions

www.shopdacsolutions.online
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SCAR as 6 ARC / 6G Platform?

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Anyone done a 6 ARC SCAR yet? Seems like the beefed-up SCAR bolt would do wonders compared to the more fragile retrofit design of forcing a standard AR15 bolt to accommodate a 6ARC case. While the JP one (pictured on right) does fine in one of my 6ARC builds, it clearly not designed for that large of a case head. Certainly, no engineer would design it like that on purpose.

On the other hand, the SCAR 16 is massively overbuild for 5.56 (as it was designed with multicaliber geometry in mind that never manifested as the SCAR 17/20 took over all the work), and seems like at the 6ARC case head dimensions it would be perfect. The SCAR also already has steel side rails inside the receiver for the cam pin, much like Geissele's SOCOM offering, intended to alleviate excessive wear from a larger-than-designed cartridge adapted to the AR platform.
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Does it matter who machines your barrel?

Hey guys,
I am looking for a Bartlein barrel for my AR-10. Precision quoted me 6 weeks and $1790 with gas block ( setup for my LMT)

Craddock is 10 months out

I found another place Falkor who has them in stock with no wait. They want sub $600

That being said, is it going to make a big difference to spend $1790 with precision or just get the other Bartlein and send it to D. Wilson?

Firearms AO Carbon/Ti 6.5 SAUM

For sale is an Accurate Ordnance built 6.5 SAUM. The rifle has 193 rounds through it and was used for rec shooting and deer hunting. It is in excellent condition. I'll include all 193 pieces of the 1X fired brass (130 pcs of Hornady and 63 pieces of Bertram). PM with questions. Only trades I'll consider would be a near identical build in 6.5 PRC (carbon barrel, titanium action and a manners stock). Scope, bipod, break sling, stock pack etc not included. I have a few glamour shots from AO but can get more pictures if interested. $3,600 shipped to your FFL.

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SOLD WTS MDT ACC Elite chassis

Looking to sell a very good condition MDT ACC Elite for rem 700/clones in short action.

It has some slight signs of wear but overall it is in great condition.

Please ask if you have any questions and text for fastest response at 6 three 6 two 9 seven 5 zero 5 five.

PayPal friends family payment please.

Currently not looking for any trades.

Selling for $1250 shipped.

Thanks!
Ben

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retired Green Beret "Super" Dave Harrington Died at 64

I saw this at Soldier Systems Daily- retired Green Beret "Super" Dave Harrington died at 64 of brain cancer. Unfortunately I never had a chance to train with him. Rest in peace, MSG. Condolences to his family and friends.



"In Memoriam – Dave Harrington

September 21st, 2025
MSG Dave Harrington was friend, inspiration, instructor, and mentor to many readers of SSD, me included. Although we were never close, everytime I saw him he acted like we were lifelong friends and he wanted to catch up. He passed away last month but I’ve been waiting for a proper bio to share this man’s incredible story.

May He Rest In Peace, he more than earned it.

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David Alan Harrington
August 1, 2025 (Age 64)
Greenwell Springs, Louisiana
Special Forces

David Alan Harrington, age 64, transitioned to glory on August 1, 2025, in Greenwell Springs, Louisiana. He was a beloved, son, brother, uncle, cousin, and friend who will be fervently missed by all who had the honor of knowing him. Dave was born on November 2, 1960, in Baton Rouge, Louisiana, to James Harrington and Nell Marhefka. He graduated from Live Oak High School in Watson, Louisiana in 1979. After graduation, he followed his passion to serve our great nation and began his lengthy career in the U.S. military. Dave served fearlessly in the U.S Navy, and the U.S. Army from 1986-2004. He earned numerous commendations, honors, and medals throughout his years of dedication. Dave was a respected Army Ranger, Green Beret, and Special Forces veteran. Some of his accomplishments include the meritorious service medal, National Defense Service Medal, Marine Corps Expeditionary Medal, Expert Infantryman Badge, Master Parachutist Badge, Royal Thai Army Airborne Wings, Special Forces and Intelligence honors and many more. He is a true American hero and will continue to be celebrated for his incredible sacrifice and commitment to our country, his family, friends and to his integrity. He was known as “Super” Dave Harrington for many reasons.

Dave spent the first half of his life serving and protecting others. He spent the second half of his life teaching others to protect themselves. After completing his military career, Dave entered the Firearms and Outdoor Industry. He is widely recognized as a prolific and exemplary firearms instructor and competitive shooter. He enjoyed sharing his knowledge and skill with individuals and groups, from high-level military tacticians to civilians wanting to become more skilled with their knowledge and use of firearms. Through Combat Speed, LLC and Martial Gun, Dave trained countless people to better their mindset, individual skills, and overall confidence to be their absolute best – which was, to him, always something to keep training towards, no matter how good you thought you were. He was a sponsored competitive shooter and was supported by so many companies along the way that believed in him and his outstanding skill and his drive for excellence. Dave was an unwavering supporter of our 2nd Amendment rights and an avid hunter.

Words are not sufficient to describe the impact he has had on the firearms and outdoor community. He will forever be known as one of the VERY best of the best; not just for his skill, but for who he was as a man. Intense, loyal, focused, deep-thinking, accountable, trustworthy, dedicated and kind-hearted are words that only scratch the surface of who Dave was. He was a unique human being blessed by God with immense talent, an immeasurable will and great strength for endurance.

Dave exemplified excellence through his strong work ethic and unwavering devotion to doing what was right. He embodied this belief: “Do the right thing, at the right time, every time.” He loved his country. He loved his guns. He loved his family. He loved his friends and good times together. He loved AC/DC and playing the guitar. He loved his cats. In his final days, he loved hearing Psalm 91 read aloud. He would want you to read it and think of him. He said what he meant and meant what he said. He was impactful, honorable, and unforgettable.
Dave fought valiantly until the very end at 3:33AM on August 1st . Two of Dave’s common phrases were, “That’s all I got” and “OK, here goes” … They are the perfect exit and entry from his last moments on earth and his first glimpse of eternity. He would not want us to mourn him in sadness, but to simply look ahead to the day when we will see him again.

Dave is survived by his stepbrother Eric Wesley Harrington (Pamela Harrington) of Baton Rouge. Brother, Peter Wayne Harrington of Portland, Oregon, aunt and uncle Sue Harrington Talley and Wayne Talley of Greensburg, LA, cousins Vickie Harrington Smith (Charles Everett Smith); Elizabeth Harrington Robertson; Renee Harrington; Shannon Harrington Kennedy-Perri; Fred Newman, III; Mitchell Newman; Darren Talley and Cherae Talley Slack, and numerous other cousins, nieces, nephews, and cherished friends.
Dave is preceded in death by his beloved father James Edward Harrington; Mother: Gay Nell Marhefka; brother Jon Everett Harrington; paternal grandparents Pearlie Everett Harrington and Hazel Margaret Young Harrington; uncle & aunt Bobby Gene Harrington and Beverly Williams Harrington; aunt and uncle Lela Ann Harrington Newman and Fred Newman, Jr.; and cousin: Kara Danette Talley Worthington.

In lieu of flowers, please consider a donation in Dave’s memory to either the Special Forces Trust (sftrust.org) or the Black Dagger Military Hunt Club (www.blackdaggermhc.org/how-to-support/).

This obituary is courtesy of Bonnie Cooper’s tireless work at Special Forces TAPS on Facebook."

SOLD Mcmillan a4 adjustable r700 sa LH

Mcmillan a4 adjustable comb via thumb screw. R700 inlet SA left hand. Comes with unknown make bottom metal and action screws. Short pic rail forend, flush cups on right side. I believe m24 barrel channel. I did remove a little material for bolt knob clearance. $450 shipped. I can do Usps m.o., or Venmo.

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Optics Nightforce NX8 2.5-20 Mil

Selling a lightly used Nightforce NX8 2.5-20x50 Mil-C, F1
W/ box and accessories. $1400 shipped tyd. Leave me a DM if you want it.

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SOLD XLR Envy Pro

XLR Envy Pro for Rem700 SA and clones. Chassis has been used in about 4 or 5 matches. Has your typical wear and tear in the magwell but overall is in good shape. Action screws are a little gummed up from loctite. Screws in the rear buttstock have a little rust on them.

Comes with:
Rear bag rider
Rear buffer tube weights
Folding stock adapter
External weights
Full length top rail
Thumb shelf

Please note: I purchased the external weights on here from a fellow hide member. He had some sort of rhino lining material on them. I sanded the material off and repainted with spray paint the best I could. Obviously the paint has wore a bit since then but overall they serve their purpose.

$750 shipped conus
Paypal ff or venmo only
Please PM only

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