I havnt been able to find any 12.5 .300 barrels for a reasonable price. In the meantime I’ve come to like 16 inch .300. Reloading 110s for 2600 is kind of dope. The thing is also amazingly engineered. Swapping 5.56 and .300 barrels requires ZERO windage adjustment.

So we have a 125gn, a 150gn, and a 220gn on the table and we open them up to look at the powder charges inside. Would those charges be the same or are they all going to be different? Does the lighter bullet make the cartridge supersonic or is there a difference in the powder charges also?

https://preview.redd.it/35unf0ijndvd1.png?width=1612&format=png&auto=webp&s=f688d8d96e9ef30e037e3937f334c78a3eea24b3

So, looking to half ass build a 300 blk self defense pistol that can shoot subs and supers reliably. Was wondering if anyone has had success with this upper and despite it being 8 inches, would the 1:7 twist be okay when shooting supers and subs. Comes with a Low profile gasblock and pistol length gas tube.

Was going to add this to my sylvian arms lower I built for pistols a while back and eventually grab a suppressor.

Just wondering if I am on the right track on building and having the necessary setup to be able to run subs and supers just fine. Also, any recs on buffer tubes and springs? Currently have a binary in but def going to switch it out for a 2 stage.

Any help is appreciated. Thanks all.

Their 8.25” 300blk barrels are phenomenal.

Noveske 8” barrel and gas block. Q cherry bomb. BAD lightweight receivers. Lightweight aluminum bcg. Radian ch and ambi safety. LaRue trigger. Sb mini brace. Coda handguard. Carbon fiber handstop. Rugged obsidian 9

Hey guys, just joined this sub. Probably has been asked and might get shunned for asking a question that gets asked 10000x. Just got approved for .30 cal can. Me being me, now I want a 300blk to run it with. I would love to be pointed in the right direction. I’d love to have it for a book bag, truck gun when I go hiking or out of town. My side arm before I’m asked about that is a 10mm G20.5 with hand-loads. Don’t want to use the 300 blk for hunting as I have a 300 win mag and 7 rem mag for deer and 6.5 creed / 243 win for my varmint cartridge.

So what barrel length, stock, optic do you guys recommend. Also ammo, doesn’t have to be subsonic but just ammo in general, can be hand-loads or factory.

Thank you guys for your time.

Side note I have a 5.56 Ruger set up already. But it’s for home defense, crackhead gun on the farm.

Looking for advice on what stripped upper to start a 300 Blackout AR Pistol build with. I was told to start looking at, in order:

• LMT
• Radian
• BCM

Thoughts on the list? Additional suggestions?

Next, what restrictions do I need to pay attention to? This will be my first AR Pistol build and I want to make sure I’m in compliance. For example, I believe I read a post earlier about not putting on any angled foregrip attachments to the handguard — things of that nature. I have referenced this USCCA article for most of my research on what specs I need to be wary of, but can’t hurt to doublecheck with you nice folks here who know better than I.

Thanks for the help and suggestions!

Just had a crazy thought. Is it possible to cram enough powder in (and not blow up your gun!) to propel something like the 200gr trex to supersonic velocities?

I’m want to order a Spear Lt 9” in 300blk and found a deal but I cannot determine the difference between these two models? PMCX-300B-9B-IR PMCX-300B-9B-LT

I’m tired of searching the internet.

I’m new to the 300BLK scene and was wondering if these uppers are any good? for context I am trying to build a pdw/ bag gun so this will be for defense. But I’m trying to build a good reliable rifle without buying super Gucci stuff if possible…let me know what y’all think and how you built yours

Looking for a little direction. I just got a diamondback db15 (Db1915b061) in 300blk. I have an existing rugged obsidian9 suppressor I’d like to run with subsonics on it. Not sure what type of muzzle adapter I’d need for the db15 or if I’d need to change piston in the suppressor.

I currently run the suppressor on my H&K vp9 with a griffin armament ez-lok

Any advice would be appreciated!

50-100 yard usage.

Didn’t want to shell out for a Honey Badger or DD PDW so I pieced together my own little guy. Weighs in at 5.56 lbs unloaded, 6.5 lbs loaded.

Upper:

• Aero Slick Upper
• Quentin Defense 7” 1:5
• Superlative Arms AGB
• Midwest Industries 6” Rail
• Microbest Chrome BCG
• Romeo 5 Gen 2 on Primary Arms Lower 1/3rd
• Modlite PDW350
• Emissary Development Handbrake

Lower:

• PSA with Milspec Guts
• BCM Trigger Guard
• Reptilia CQG Pistol Grip
• CMMG Ambi Safety
• Troy Ambi Mag Catch + Bolt Release Lever (fuck Troy)
• KAK Mini Milspec Buffer Tube with chopped SBA3 clone (shoutout to u/_trapito for the idea)

• a Q G-Sling

This is my first ground-up build, and my first ever 300BLK gun. I built this to primarily be a suppressed, home defense gun. I know I may get roasted, but I’m pretty happy with how it turned out, and learned a ton about building ARs. Can’t wait to get it to the range!

Build list:

• Wilson Combat 8” Stainless 300BLK 1/7 twist barrel. (Yes, I know the flasher hider isn’t timed correctly, just using it as a thread protector until my can’s out of jail)
• Midwest Industries 7” Combat Rail
• Superlative Arms Adjustable Gas Block (which needed a custom bent gas tube from White Oak Armament, for anyone wanted to run one on a pistol)
• Holosun 510c
• Magpul MBUS 3 front and rear sights
• Aero M4E1 stripped upper
• Aero upper parts kit

-SOLGW BCG

• PRI Gas Buster ambi charging handle
• SB Tactical HBPDW brace
• Ballistic Advantage Enhanced Lower
• SOLGW lower parts kit
• LaRue MBT-2S Trigger
• Magpul K2 grip

Really starting to lean away from red dot and mag and go LVPO. Recommendations?

Question. Do I have to pay a tax stamp when I buy a rifle with a barrel under 16 inches? Also, do I have to be 21 to buy an ar pistol, and do you have to pay tax stamp on them also? I’m so confused.

I want to purchase a rifle for my son to hunt whitetail with (and obviously for me to use as well at times). I don’t have a fortune to spend on this one, and am considering the two options above in 300blk or 6.5 creedmoor. Threaded barrel is a must as I have an OCL Polo 30 ready to go.

Any experience with these specifically would be much appreciated.