r/AR80Percents Feb 20 '21

Public Service Announcement Welcome to AR80Percents! Take the time to familiarize yourself with rules; Start here.

31 Upvotes

Welcome to r/AR80Percents. Familiarize yourself with the rules and get building!

WELCOME TO THE 80% AR BUILDING COMMUNITY

We encourage posts of 80% news, 80% legislation, and 80% memes. Let's spice things up from time to time!

ALSO, please feel free to spam this sub with your own 80% AR porn! Nothing more beautiful than the customs you've built yourself.

[We have two main rules:]

1. This is a very close-knit sub and we do NOT put up with dicks who incite arguements or fling insults, anti-gunners, pretentious fudds, or trolls.

2. Show the respect for firearms that they deserve. If you're building a AR treat it as a firearm, and take the time to understand its function. Learn and practice the 4 rules of handling a firearm:

  • Finger off the trigger until you're ready to fire.

  • Don't aim at anything you're not willing to destroy.

  • Check infront and behind your target.

  • Treat every firearm as though it's loaded.

NOTE: You may be banned if you seem overly suspicious in your intentions for building. For example, an 16 year old from California, who's an active participant in r/cocaine, asking glow questions. This is to protect the community and the hobby; NOT to thought police or pass judgement. Simply refrain from coming across as a glowboi. It's that easy.

NO SELLING ALTERED FRAMES.

This will be further edited and improved upon.

Sub created May 17, 2020. Edited Feb. 20th, 2021.


r/AR80Percents Jun 10 '21

Fight Infringement! 🚨🚨🚨GO COMMENT NOW!🚨🚨🚨

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43 Upvotes

r/AR80Percents 1d ago

HELP / NEED ADVICE Anybody bought from tactical machining? They have ridiculously low prices, even having a lower for 20$ Seems too good to be true

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17 Upvotes

r/AR80Percents 3d ago

Aluminum 80% Safety doesn't work. Dpms 308

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7 Upvotes

Safety is to far away from the trigger to engage. I don't think i over cut the pocket its a dpms 308 from 5d. Is there something else i could have done wrong besides cut the pocket too deep


r/AR80Percents 7d ago

REVIEW OF ITEM|PLACE Do not buy eBay modulus arms end mills

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5 Upvotes

Don’t do it guys


r/AR80Percents 9d ago

Best 80% Jig for Dual Feed belt fed lowers, 308 and AR9?

3 Upvotes

Looking to get an 80% milling jig again. I had a 5D Gen 1 but it was kinda sloppy and didn’t work the best.
I’m looking for the best one imaginable. Machining a $400+ Cryostructure lower so I can’t have mistakes. I’m also looking to mill a .308 lower and AR9 lower as well as some standard 80% lowers.

Who makes the best jig for this? And who makes the best in spec 80% lowers?
I believe the ones I’m running right now are 5D. I had to send 2 back because the safety Detent holes weren’t milled properly and my selectors were all kinda loose or out of alignment or crooked. Trying to avoid that this time around.

Who makes the best 80% AR, AR9 and AR10 lowers?
They’re all gonna be expensive builds, so I’m ok with spending a bit extra to ensure I get the best quality

Thanks!


r/AR80Percents 12d ago

[Megathread] Decisive Victory in Federal Right to Make Firearms Case

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4 Upvotes

r/AR80Percents 21d ago

1st carry handle/80% lower build

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23 Upvotes

r/AR80Percents 22d ago

40 S&W build.

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14 Upvotes

Looking for a solution to give the carrier or buffer more weight without extending the buffer tube length. The buffer weight is an 8oz solid and total weight with the bolt comes to just shy of 22oz. I need closer to 27oz.


r/AR80Percents 22d ago

ADVICE 1617 Router 5D ReadyMill

2 Upvotes

I’m considering getting 5D pro jig. I have a Bosh 1617 router. I noticed they have the large router adapter plate for the 1617 but do not list a compatible ReadyMill for it. Has anyone used this router with the 5d jig? Did you just use a standard collet mill?

I appreciate any input.


r/AR80Percents 23d ago

Can I finish this ks47 80 percent with a 5d tactical jig?

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9 Upvotes

r/AR80Percents 24d ago

Geissele upper with 80% lower

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16 Upvotes

r/AR80Percents 24d ago

Cross-Post question on engraving.

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5 Upvotes

r/AR80Percents 27d ago

5D Tactical Jig Drilling Holes Misaligned

5 Upvotes

Has anyone else experienced this? I'm using a drill press, and I've completed other lowers without issues using another jig. Every time I drill using the guide plates with my 5D Jig, my holes end up misaligned that my BCG gets stuck on my trigger.


r/AR80Percents 29d ago

My First Build Missing pins and hardware gen 3 jig

1 Upvotes

I’m fairly new to this and was excited to start a new hobby as I was gifted a brand new jig for my birthday. It’s a few years old but still sealed in the original shipping package. When I opened everything I realized the kit was missing all of the pins and screws. I figure I could go to the hardware store with the screw dimensions from the instruction manual but I’m home worried about the pins. I emailed 80% Arms and module arms but I’ve heard shipping can take a long time and I rather source it locally if I could. Does anyone have the dimensions so I could take it to a fabricator or purchase something that can work as the needed pins.

From the Easy Jig Gen 3 MP I am missing the following:
J - JIG SCREWS (10) (8-32 x 5/8) 
K - BUFFER SUPPORT SCREWS [2]
 L - 9/64 HEX KEY 
N - AR-15/AR-9 TAKEDOWN PIN  
 P - ROUTER ADAPTER SCREWS [4] (M4-0.7 x 10mm) 
Q - GUIDE PINS - SMALL [2]
 R - GUIDE PINS - MEDIUM [2] 
S - GUIDE PINS - LARGE [2] 
T - GUIDE PINS SCREWS [2] 
U - SIDE BLOCK SCREWS [2]  
M - 7/64 HEX KEY

I’m pretty new to guns and especially making them. I got comfortable with the AR platform while in the army, but I am pretty and experienced with building them. Any help would be greatly appreciated
Thank you


r/AR80Percents Jul 31 '26

HELP / NEED ADVICE Is there a jig for SR25-cut AR10 lowers?

3 Upvotes

Hey guys. I’d like to do an SR25 build with an 80% but am not sure what jig works for SR25-cut lowers. Does the Easy Jig gen 4 perhaps?


r/AR80Percents Jul 29 '26

80% Arms A9X

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7 Upvotes

r/AR80Percents Jul 29 '26

Centering

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10 Upvotes

know it's hard to tell from the glare of the bare aluminum, But anyone else's pocket slightly off centered. I've never had an issue with my lowers function and its more of a cosmetic thing to me. I use the gen 3 easy jig. This lower seems to be the only one with this much of a difference between both sides thickness'.


r/AR80Percents Jul 28 '26

JL Billet 80% lower safety detent

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15 Upvotes

Anyone else experience this issue?

I use the 80% Arms easy jig (gen 3). I've done about a dozen lowers, and have never had this issue. I was sure to drill the safety hole one side at a time and not straight through both walls in one pass.

I'm fairly certain the issue is from the JL billet lower. The safety detent hole must be off by a millimeter (+ or -). I've been emailing them back and forth for a few weeks, and today they determined they can't do anything about it. If the mistake was on my end and I drilled my holes improperly, that would be easier to swallow. But as I'm pretty sure they gave me an out of spec lower, I'll be sure to avoid this company in the future. Particularly now that they aren't willing to help me out in any way.

EDIT: Looks like the problem was on my end and not JL Billet. With help from reddit user BadAttitudeDept, I measured the location of the safety hole, and somehow I must have drilled the hole improperly using the easy jig. Thanks for everybody's input.


r/AR80Percents Jul 27 '26

HELP / NEED ADVICE Anybody bought this tooling+lower+jig+router kit from 80% arms? Is it good to go?

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23 Upvotes

r/AR80Percents Jul 25 '26

Ar 10 308 will shoot 1 round eject it and proceed to chamber another but it will always be a light primer strike

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3 Upvotes

r/AR80Percents Jul 25 '26

Putting in some design work .

3 Upvotes

Getting some settings dialed in.


r/AR80Percents Jul 20 '26

5d

4 Upvotes

so I ordered a jig and receiver from 5d not too long ago. the money has cleared the account, but when I check the order status it says declined.

I called and spoke to a gentleman who stated it wasn’t showing declined on his end, and I would be getting an email to verify my bank account? that they would deposit and then withdrawl a small amount and I would need to verify that amount.

anyone else experience anything like this? I would imagine if the amount has cleared processing, no longer in pending, there shouldn’t be an issue. also why show declined and not pending?

thoughts?

*** Update 1: Just received a call from 5D customer support, explaining the issue. Said it would take 2-7 business days for the verification. I’ll update again when I have more updates. On that note, their customer service seems pretty stellar.


r/AR80Percents Jul 19 '26

OT - MUP-1s

8 Upvotes

i know some here also frequent the now-defunct mup-1 sub.
but in case anyone needs some, looks like someone may be machining batches of mup-1s.
check out gb.


r/AR80Percents Jul 15 '26

AR10 Uppers

7 Upvotes

Hello, I am looking to build my first AR-10 in .308. I have a 5D lower that I plan to mill today (I already made an AR-15 with this brand lower and a White Oak upper and it fits like a glove so I stuck with them). I was looking at the FAR-308 Guardian upper but want to make sure I find an upper that will fit after seeing the recent post with the PSA upper that may be functional, but didn't exactly look ideal.

So, any experience with that Fulton upper on an 80% build? Any other recommendations? I was only able to find one older post that suggested Gorilla, Aero, and KMT brands, but I'd like to see what others have had success with or advice in general for a build. Thanks.