Brownells Titanium 308 BCG vs JP LMOS with HP bolt

jh2785 · Jan 19, 2024

I've got a new 6.5 CM upper on the way and I'm trying to save some weight and a little kick with a low mass BCG. I'm cross shopping the Brownells Titanium BCG and the JP LMOS with the high pressure bolt.

Brownells' 308 BCG looks like a ToolCraft product and in the DLC finish, which I've is super slick and is only 12 oz and I can probably get it for about $260 shipped.

The JP LMOS is pricier, a tad heavier (14.5 oz) but also comes with a high pressure bold that the creed might like better. I perceive the JP to be of higher quality and durability. Street prices are $450 - $480.

My concern is if I go the cheaper Brownells route to save some money and a little weight....... that I'll end up needing to put a high pressure bolt in it down the road ...... in which case......I'd prob just get the JP Rifles LMOS with the HP bolt for $450+ bucks.

Any thoughts on how they compare? Anyone used both?

Chickentoast · Jan 19, 2024

I went with the Brn Ti on my 16" 308. No issues so far, but I wanted the JP Ti VMOS, which was out of stock everywhere at the time.

JP Rifles

jh2785 · Jan 19, 2024

Chickentoast said:
I went with the Brn Ti on my 16" 308. No issues so far, but I wanted the JP Ti VMOS, which was out of stock everywhere at the time.

JP Rifles

Did you end up having to adjust your gas block for it to run well?

Chickentoast · Jan 19, 2024

jh2785 said:
Did you end up having to adjust your gas block for it to run well?

I only run hand loads, which are 155 eld's, and plastic buffers with a tubbwire spring - took 2 clicks on my SLR adj and haven't changed since. Sewing machine, but only handloads...

45-90 · Jan 19, 2024

I have used the Brownells Ti 308 bolt carrier, no issues, with adjustable gas block.
I went light weight... with carbon fiber handguard, magnesium upper, titanium muzzle brake fluted SS 16" barrel, for a 6 lb 3 oz AR 10.
With a variety of handloads 155, to 208 eldm.
Even single loaded the 225 eldm...hot loads turn down the gas, but normal 155 to 179 SMK loads all run the same setting. So far it's handled every max load, without issue. Haven't used the JP product at all....but it's your dime, as they say.

louu · Jan 19, 2024

I use to be really heavy in to 3 gun, like almost every weekend for years. I've seen almost a dozen JP bolts snap around the cam pin. Those were 223 not 308 bolts but I'd imagine it to be the same metal.

jh2785 · Jan 19, 2024

louu said:
I use to be really heavy in to 3 gun, like almost every weekend for years. I've seen almost a dozen JP bolts snap around the cam pin. Those were 223 not 308 bolts but I'd imagine it to be the same metal.

Yikes

jh2785 · Jan 19, 2024

I just read Brownells "Guaranteed Forever" warranty, which allows me to return it at any point....and get credit for it. I may go ahead and grab the Brownells and just return if if I end up needing a HP bolt.

Redlion · Jan 19, 2024

Why not just buy a JP High Pressure bolt kit instead of the whole BCG if the Brownell's fails?

https://jprifles.com/1.4.7_Bolt.php?menu_select=HPbolts

mettee · Jan 19, 2024

I'm gonna recommend a full mass bcg, you will have to keep this rifle in such a small window to function consistently if you go with light weight components. I think you will end up frustrated.

45-90 · Jan 19, 2024

jh2785 said:
I just read Brownells "Guaranteed Forever" warranty, which allows me to return it at any point....and get credit for it. I may go ahead and grab the Brownells and just return if if I end up needing a HP bolt.
View attachment 8327290

I actually used that guarantee once, when a major manufacturer tried to delay the return, to run out their 30 day return policy. I ordered their part through Brownells, and Brownells said sure return it...I did for a free replacement.

jh2785 · Jan 19, 2024

mettee said:
I'm gonna recommend a full mass bcg, you will have to keep this rifle in such a small window to function consistently if you go with light weight components. I think you will end up frustrated.

I’ve got an adjustable, gas block, even with that? It’s the superlative arms bleed off type.

TheOE800 · Jan 19, 2024

louu said:
I use to be really heavy in to 3 gun, like almost every weekend for years. I've seen almost a dozen JP bolts snap around the cam pin. Those were 223 not 308 bolts but I'd imagine it to be the same metal.

Improperly heat treating 9310 is apparently common.

jh2785 · Jan 19, 2024

Redlion said:
Why not just buy a JP High Pressure bolt kit instead of the whole BCG if the Brownell's fails?

https://jprifles.com/1.4.7_Bolt.php?menu_select=HPbolts

Well, I’m going to go with something low mass to save on weight and I wouldn’t mind if the recoil went down. I’ve got an adjustable gas block so if I’m gonna have to get that bolt anyway, I was considering going to the JP BCG (with HP bolt) route from the get-go.

45-90 · Jan 19, 2024

Yes, a full mass bolt carrier is how it was designed and runs through a wider window, usually..easier..And a good recommendation for most.
But a light weight bolt carrier is very reliable if tuned correctly...and sometimes needed in certain applications. Like gaming, high rounds per minute, well above normal full auto fire.
Or just building an ultra light AR.
A shooters choice, you can have both...

45-90 · Jan 19, 2024

Like I said , your dime, but I'd never pay JP prices. Toolcraft makes a .062 high pressure bolt too, same tool steel. I run them in alot in high pressure loads, no problem. Like 6.5 CM 150 SMK 2842 fps 24" AR 10 same load in the 24" bolt gun...
The Brownells Ti carrier in 308 16" is running 155 gr 2815 to 2900 in a 16", and 168 gr eldm 2756 fps with excellent accuracy in the 16" barrel ...obviously high pressure loads with that to bolt carrier as sent from Brownells.
Just saying all my ARs take the same pressures as the bolt guns...without going to JP.
The high pressure bolt does not allow any more pressure to be utilized, before the brass gives away. Not supposed to run high pressure bolts any higher than a non high pressure bolt....says so from the manufacturer.
The small firing pin dia will help with primer flow.. then you can get dual ejectors, I have tried all that. Its not needed unless you are having ejection problems, with your zippy loads. I almost never run nothing but high pressure loads...in everything.
Like I said, your dime, I do not care how you spend your money or build your gun...this is just my experience...for what it's worth. 2 cents or a dime for inflation.
You should build it, exactly how you want it, heavy and cheap, or light and expensive.
Maybe in between.

Redlion · Jan 19, 2024

Toolcraft making "bolts" must be a fairly new thing? I spoke with their customer service a couple years back and they said that they only manufactured Carriers, not bolts.

45-90 · Jan 19, 2024

Redlion said:
Toolcraft making "bolts" must be a fairly new thing? I spoke with their customer service a couple years back and they said that they only manufactured Carriers, not bolts.

Yeah they have their name on some other vendors work, like many...they do not manufacture everything in house. Not concerned with who makes it, as long as it works for me. Look at the typical automobile, Toyota on the car name tag, but many parts made in China...GM or Ford on the name tag, various vendors across the globe. Mostly just the way it is.

mettee · Jan 19, 2024

jh2785 said:
I’ve got an adjustable, gas block, even with that? It’s the superlative arms bleed off type.

Yes for sure. Your basically making it to where you can run one load(as stated above where the guy said he hand loads). The pressure and bullet weight has to remain consistent or you will have to be adjusting gas for each different round you run. And it will be finicky. A gas block can't change the pressure; just volume.

Again, I would avoid light weight in an ar10 unless you are building a race gun or toy. Keep in mind you have to also consider your buffer spring and buffer in this....

I would go with the Rubber city set up, they are HP, nitrided, full mass, and you can also get one with an adjustable gas key.

Standard Mass AR-10 .308 Win+ Multi HP Calibers DPMS complete W/ Assist & Adjustable Gas Key - Welcome to Rubber City Armory

This is a complete AR-10/SR-25 DPMS style BCG with Blacknitride+ finish Carrier is fluted WITH FORWARD ASSIST and incorporates RCA's ADJUSTABLE billet gas key Bolt face is specifically machined to handle high pressure rounds. The firing pin is custom matched to this firing pin hole. Caliber...

rubbercityarmory.com

I shoot a 260, same and different

the recoil is non existent. My reciprocating mass is 28.5 oz. My gun functions with factory ammo, hand loads, suppressed and not, all day.

jh2785 · Jan 19, 2024

Thanks for the info!

Chickentoast · Jan 20, 2024

Agree with guys above - all about what you want. I chose to build my rifle based on the projectile and velocity I wanted - and don't plan on running any other loads. With that load, it's reliable, low recoil, and is about 5.5 lbs before glass. But I'm sure it would be a dumpster fire if you handed me 10 different loads in the same mag. Reciprocating system is akin to picking bottom end components for a motor build...

KineticPerformance · Aug 22, 2024

For those with the Brownell's Ti BCG, have you seen the finish wear like this on the bolt? It's been fired 40 times. I've never seen this before.

Chickentoast · Aug 23, 2024

Just checked mine - I have close to 100 rounds on it and the coating is as new. I'd ask for a new one.

KineticPerformance · Aug 25, 2024

I already have the RMA but shot it in a match this weekend where it ran fine and I finished 2nd but the finish is nearly completely gone from the bolt face

Chickentoast · Aug 25, 2024

FYI also my coating is more matte gray - yours looks shinier black, at least in the pic - unsure if they changed it at some point. Think I bought mine in late '22. If it's good Ti, can't see why we'd need a coating at all. Since lifetime warranty, maybe run it some more and see how it evolves?

45-90 · Aug 25, 2024

Chickentoast said:
FYI also my coating is more matte gray - yours looks shinier black, at least in the pic - unsure if they changed it at some point. Think I bought mine in late '22. If it's good Ti, can't see why we'd need a coating at all. Since lifetime warranty, maybe run it some more and see how it evolves?

The bolts are steel, just the usual stuff.
The carrier is titanium.
Mine has close to a thousand rds, with nothing unusual.
It can be replaced with any bolt of your choosing, they are pretty much all identical made out if the same 2 steels from the same few factories, with the same heat treat and inspection. On CNC machines.
I'd just run it, it's working, the coating will wear. It's the steel bolt doing the job, not the coating. Just keep it lubed.
The titanium is great... but the aluminum carriers will wear once the anodized finish is worn off the carrier, the bolt is still steel.

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Brownells Titanium 308 BCG vs JP LMOS with HP bolt

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