Tech Tip: BRN-9 Upper Disassembly, Maintenance & Reassembly
Вставка
- Опубліковано 26 сер 2024
- You bought a Brownells BRN-9® upper receiver, matched it up with a compatible AR-15 lower receiver, and built the 9mm PCC of your dreams. To help you keep it running reliably, Brownells Gun Tech™ Caleb Savant shows us how to disassemble, perform routine maintenance, and reassemble the BRN-9 upper. Good news: no tools are needed for basic field stripping!
DISASSEMBLY: Check to make sure the firearm is UNLOADED. Pull out the pivot and takedown pins to free the BRN-9 from the lower receiver. Push in on the serrated cover at the rear of the BRN-9. The U-shaped piece of metal below it should drop down, or you may have to give the "U" a little tug. This backplate can now be removed from the receiver. The guide rod and the recoil spring will come with it.
Tilt the rear of the receiver down with your hand behind it to catch the bolt assembly as it slides out. The bolt body and the counterweight are just dovetailed together and easily separated. Pull the charging handle all the way to the rear of its channel, where you can easily remove it. The charging block is now free to slide out of the receiver as well.
CLEAN-N-LUBE: Clean up the receiver and the other parts, as you would on any firearm, and run a bore brush through the barrel. If the bolt is particularly gunky, grab a punch and push out the firing pin retaining pin to remove the firing pin and its spring for deeper cleaning. Apply a little lubricant to the wear spots on the bolt.
WHAT TO REPLACE: Over time, the recoil spring and rubber buffer on the backplate will wear out and need to be replaced. Wear is affected by the ammo you use and how much you shoot suppressed. A good rule of thumb is to replace these parts every 5,000 rounds.
REASSEMBLY: Slide the firing pin spring back onto the firing pin. Insert the firing pin into the bolt. While pushing on the firing pin, insert its retaining pin into the bolt. Slide the charging handle block into the receiver, with the end that has the little hole facing the rear. Line up the hole in the side of the block with the hole in the receiver and reinsert the charging handle. The charging handle should ride freely in its channel. NOTE: The charging handle is ambidextrous, so you can install it in the other side of the receiver, if you like.
Slide the bolt back onto the recoil weight. With the hole in the weight facing rearwards, insert the whole assembly into the receiver. Insert the backplate / guide rod / recoil spring into the receiver, with the recoil spring going into the hole in the rear of the counterweight. Making sure the steel "U" on the backplate is still in the down position, push the backplate a little farther in than flush with the rear of the receiver. Push up on the "U," and you should feel the backplate lock into the receiver.
Your BRN-9 upper is reassembled and ready to be reunited with the lower assembly.
Loving the simplicity of the design. Thanks Brownells and Matador Arms, for more PCC options.
Very nice engineering sir,I appreciate the video.
That's pretty cool. Almost as cool as the Strike Industries Modular Fixed Stock. Can you do a review on that too?
I hear you lol. Yes, I will do that one.
@@CalebSavant thanks!
@@CalebSavanthow bad is the hick with that huge weight? I want to get something softer shooting but this probably isn’t it. I went with the Stribog because I wanted a quasi roller delayed….without paying mp5 prices.
What the diff between this and the matador arms?
Has anyone had really bad what I would say would be ejection issues? Supers/Sups/Can/No Can...
A little off topic but was wondering about moly coated bullets.
Are they still a thing?
Is it worth it?
That's a good question, it's actually a topic we're planning on doing for SmythBusters.
Any plans to do a rifle length version of this?
👍😎
Great video BUT I have spent a couple of hours on and off trying to install a front grip - Like you have . HOW did you do it. There is no room for the cam lock to fit under the barrel threads. The only way I see is remove the barrel and that might work. Please show us Barrel removal. Thank you!
can you use a binary trigger on this?
😅 I wanna know as well the bolt is different
Why not make it a captured recoil spring in the bolt? And because no one has asked..........can people with a registered fullauto lower use them?
Not yet, the bolt has no way to trip the sear, but there is room underneath and legs on the bolt for an MCX-Spear style solution to be developed.
Will this accept standard AR type barrels?
Are there any instructions/ how to’s to remove the barrel and accompanying parts? I want to cerakote mine but need to strip it down to the bare lower receiver and upper frame.
We have a tool on matadorarms to take it down completely
@@davidborges6361 thats awesome. Alittle too late as i already had it cerakoted. But the painter did cerakote the breach/ barrel face since they couldn’t get the barrel and parts out. Oh well. Still will pick the tool up for when i replace the barrel. Pcc subguns are too fun! Thanks for the heads up!
So is this still getting product support from you guys or did you cancel that too?
you can slap these on standard lowers?
I want to say yeah? In most cases it should I think he mentioned some common brand specific complaints in a previous video.
The Brownells Website say that these are No Longer Available. Just wondering why? I own one and was wondering if there are issues or if it is just a disagreement between Brownells and Matador?
I saw the rest of their stock was sold through AIM Surplus. I picked one up for $350!
I heard that there is a new model coming out but haven’t confirmed it yet.
You are correct. I saw that AIM was carrying them and for that price I picked up another one too!
How long is the handguard on the bottom?
I loved mine until I racked it and the lever snapped the plastic piece and was stuck so I couldn’t pull the lever anymore. Anyone know if I can just buy a new plastic piece that connects to the lever to rack it back?
Yes, give us a call!
What are some non Glock mag lowers that this will work with?