A standard mil-spec AR-15 firing pin should be between 3.271" and 3.280". The AR-15 firing pin we used for this test was 3.278 inches. The Lantac 6.5 grendel firing pin selected for this test was measured to be 3.270 inches.

With Standard AR-15 firing pin (RESULT SHOULD BE 0.028" to 0.036"):

• Rexus bolt - .0305 inches firing pin protrusion
• JP Enterprise bolt - .0325 inches firing pin protrusion
• Craddock Precision HD ARC bolt - .0410 inches firing pin protrusion

With Lantac 6.5 Grendel AR-15 firing pin (RESULT SHOULD BE 0.028" to 0.036"):

• Rexus bolt - .0195 inches firing pin protrusion
• JP Enterprise bolt - .0215 inches firing pin protrusion
• Craddock Precision bolt - .0305 inches firing pin protrusion

ASSUMING your bolt and firing pin lengths are similar to those used in this test, this means that

• you should always use a 6.5 Grendel firing pin in a Craddock Precision HD ARC bolt
• you should never use a standard AR-15 firing pin in a Craddock Precision HD ARC bolt
• you should always use a standard AR-15 firing pin in a Rexus or JP Enterprise 6.5 grendel bolt
• you should never use a 6.5 Grendel firing pin in a Rexus or JP Enterprise 6.5 grendel bolt

If you're still reading.....

maybe it's because you noticed that the measured difference in the lengths of my firing pins was .008 inches but there was always a .011 inch difference in protrusion. No, that's not an error. Protrusion is dictated by the distance from the front of the firing pin flange to the tip of the pin, not the overall length.

^{(Also, for those of you who private messaged me asking about a fix for the Craddock bolt issues, I haven't started working on that yet but will hopefully get to it this weekend.})

Anyone get groups out of their d.wilson 6arc barrels yet? Looking at getting a 12.5 or 14.5. Trying to get a gauge for accuracy

Price seems great. Anyone have experience on them? Looking at a 18”

First 6arc! Need to swap the scope out for something with a mil reticle and a little more precise center aiming point (couldn’t see the middle of the target when shooting groups). Still had no problem making first round impacts all the way out to 1000. 108 ELDMs going 2660

6ARC has been such a great round and I really enjoy its performance. This 12.5” has got me out to 1,200yds, and my 18” has got me out to 1,400yds. Shoots smooth and has definitely become one of my favorite rifles to shoot.

The PLXC has been a great optic for this setup. Still not in love with the chevron BUT it has not hindered my shooting and overall has been a great reticle.

I hope 6ARC takes over everything and everyone!

BUILD LIST
12.5” Noveske Barrel with pinned gas block
Surefire SOCOM6-MINI4 suppressor with brake
Primary Arms PLXC 1.5-12 Griffin Mil Reticle
Aero M4E1 Receiver Set
Cross Machine Tool 11.5” MOD 4 HDX
Geissele SSA-E
Geissele Super 42 Braided Spring w/ H2 buffer
Noveske BCG w/ Noveske 6ARC bolt
Magpul DT-PR stock
B5 Systems P23 grip
MK Machining Scope covers
Radian Charging Handle

Loving the cartridge in a 16” ar. I think I’d like to play with a longer barrel and a bolt action. Like 20-22”

It seems the tiger American is the go to, but has anyone found one under like $800 they like? I’m also down to do a barreled action and a chassis later on.

6ARC carnage from this last weekend! 12.5 fluted BA barrel. Ranges from 100 to 350

Came across this group while looking to get my first real precision oriented ar. Shooting steel for fun, and coyotes on property. Not factoring glass or anything looking at full systems and see Wilson and PWS and others around 2k. What is the go-to option? I shoot a lot of custom bolt guns and reload but never got into the AR world and craze.
Shoot 6mm creed at prs and have tons of bullets for varmints available to me here and options to try for load development.
Range to a mile (1760) is available to me
Precision and suppressed operation are the most important things to me.

My second 6arc. 12 inch piston build on a centurion arms upper with a c4 quad rail. Hoping to shoot it soon.

Fat nannie!
44y
20-25 death run no blood
6arc Howa mini
OCL Hydrogen L
95TMK 2625fps
29gr Varget
2.280oal Starline

Boy was it quiet in the woods during the shot with the OCL Hydrogen L.

She was really cautious coming in, but she was clearly a seasoned doe. She’s the biggest I’ve ever taken. Short of any blood trail, the 6arc did its job. Having a sample size of 5 with the 6.5 Grendel and only one with the Arc, so far I’m more impressed with the damage and blood trails of the Grendel.

I need more samples with the arc. Maybe try the 107tmk next?

Pretty cool Hornady is still pushing the offerings for 6 arc in the sbr suppressed line of ammo. Box says it’s made for 14.5 inch barrels. Does anyone have a shorter than that barrel? Has anyone/will anyone shot/shoot this ammo yet? Is the ELD Match the ruggt projectile for this load?

Building my parts list for my upper. Trying to decide if the Proof Research PXT barrel is actually worth it or if I save some money and get a different one. I’d like to use this rifle in gas gun prs matches and some hunting when able.

12.5 Noveske barrel. G upper, CH, trigger, mags. Vltor freedom rail. Magpul grip, PR stock. Griffin BCG, tube, SOB, spring. PA PLXc.

CCI 450 vs Federal 205MAR

Working out of town and there is a reloading shop nearby with decent priced primers compared to other places near home. I am looking to pick up a couple thousand before heading home. Will finishing putting my 6ARC together this weekend so I haven’t have the chance to load for it and shoot it yet.

Which primers pair best with LVR and Staball Match?

More specifically for a shorter barrel. Looking at getting a 12.5, boss offered me his 2-10 TMR for my pr2 3.6-18.

Looking to hear from people who have shot the barrels how they like them. Doing research there is alot of splits on Faxon, but it seems a lot of people not recommending them just say they don’t recommend them, not seeing any actual shooting experience on them when I reach out to some.

I have a friend who was going to do a 20” build using their X match barrel. But he is going another route, and is offering to me as an early Christmas gift. But wanting to see if I’m better off selling it or running it.

Need help building 6 ARC build! Reading through this sub has confused me even more lol. I am looking to use the PSA ICAR so that I can use the Pmags. I have no idea of what barrel and bolt/BCG combo to use for this. I am using it as a SPR/DMR role and not wanting any carbon fiber barrel. Not looking to spend out the ass but don't mind spending to get the mid tier parts. Don't know if I need to wait for PSA E4 bolt and barrel or are there good options out there now. Please give suggestions.

Thank you!

Posted this in the thermal subreddit…..

What do you guys think over here?

So I’m in the look for hunting ammo and hornady blacks are what shoot the best, anyone have any experience with them on whitetail? And also advice is helpful too

Using a PSA ICAR receiver and a Shaw barrel, the Craddock Precision bolts simply don't work. But I can't figure out which is the problem. I was hoping anyone who has experience with using the Craddock Precision bolt with PSA's ICAR receiver OR a Shaw barrel (in a non-ICAR receiver) could tell me if they've had any issues with cycling, chambering, etc. After using the Rexus, JP Enterprise, and Craddock bolts, only the Craddock is giving me issues. Thus, I am kind of shocked by the previous posts saying "Craddock HD Arc Bolt Good to Go," and I'd love to hear anyone else's feedback. Pertinent negatives: Ruled out gas system issues, feed ramp transition issues, bolt carrier issues etc. It's definitely a bolt match issue with either the ICAR receiver or the Shaw barrel.

I AM NOT RECOMMENDING THIS LOAD TO ANYONE. THIS IS WAY IVER RECOMMENDED PRESSURE.

A few buddy’s and myself have been doing a lot of testing trying to optimize our 6 arcs to run high pressure ammo and I wholeheartedly believe the surefire OBC is a necessity for high pressure ammo.

The pic above is 32.2gr of lever with a 90 TacTx from a 14.5 DDF and the surefire OBC with a CAT VB6 suppressor. Anyone who has run high-pressure ammo knows your brass gets absolutely mangled. The OBC delays the unlocking long enough to allow pressure to drop before extraction. Also, based on the counterweight design in the carrier, it slows the carrier down during unlocking which reduces stress on the lugs.

We also tested the LMT enhanced carrier with an A5H4 buffer and while it helped, it performed quite a bit worse than the OBC.

The OBC also reduces recoil to a similar feel of 556 with 77gr.

I’m right around 600 rounds with the OBC and bolt gun pressure ammo and have had zero failures. I personally am not running the load above but I am running Berger 105s at 2700 out of an 18in PXT suppressed. Time will tell if it extends bolt life but if you want reduced recoil or to reload high pressure ammo, the surefire OBC is a definitely the way to go.

Hey just wanted to get some tips for my first build. Went for a big build for 600 - 1000 yard shooting. Went with a 20" Grendel Hunter upper with a SS barrel. Thing is heavy as hell, as expected. Seeing a lot of the more perpendicular grips, is it worth swapping? I have other uses for the standard magpul grip. Also not 100% sure this scope (3-18x50 Trijicon) will be the final scope on it. Also a really cheap Stacy's Mom supressor will be upgraded as well. Excited to get it sighted in, have never shot 6mm ARC.