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Completing your 80% lower receiver manually #4105499 05/24/16 04:18 PM
Joined: Jan 2007
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Merkava_4 Offline OP
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Joined: Jan 2007
Posts: 17,501
80% Arms Instructional Video

Some Guy on YouTube Following the Instructions

I think I like the manually finished concept better. You get to use a cool jig and some power tools. smile

Re: Completing your 80% lower receiver manually [Re: Merkava_4] #4105501 05/24/16 04:22 PM
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hatt Offline
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Saves $1500 on the CNC machine. Those cheap mini mills would probably be pretty good for little projects like this.


2013 F150 5.0, Delo XLE CK-4 10W-30, Baldwin B7449
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: Completing your 80% lower receiver manually [Re: hatt] #4105644 05/24/16 07:11 PM
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Jim_Truett Offline
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Originally Posted By: hatt
Saves $1500 on the CNC machine. Those cheap mini mills would probably be pretty good for little projects like this.


You're about $1500 into a mini-mill once you get it tooled up properly, if you want a professional looking job. It will also be capable for so much more.



2008 F250 6.4 PowerStroke 52k
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Re: Completing your 80% lower receiver manually [Re: Merkava_4] #4105654 05/24/16 07:18 PM
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hatt Offline
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Very nice.


2013 F150 5.0, Delo XLE CK-4 10W-30, Baldwin B7449
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
Re: Completing your 80% lower receiver manually [Re: Merkava_4] #4105672 05/24/16 07:29 PM
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CT8 Offline
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The best is to use a CNC mill with a good program but with care a great job can be done with a big drill press and a good jig. The huge problem in my opinion is that the commercial manufactures of the mil spec forgings hard anodize the lower after it is machined and the hard anodizing is about as hard as Sapphire or Ruby I really can't remember which. Plus the anodizing makes trigger pins holes smaller to make a better feel on the trigger. The way around the trigger pin slop and wear are over sized KNS anti rotate pin kit. Over sized pins are great on any AR and when using them on a factory done milspec anodized lowers or complete rifles. The anti rotation is not needed, just over sized. The in my opinion Giselle triggers work well is because they come with over sized pins.
How do I know this about 80% lowers is because the house about a 1/4 mile away was rented by 5 guys that went to a Christian College in the area and they were wonderful guys . I wish all the Young adults were like them. I helped them with the first two and they instantly mastered the process made a bunch of others for themselves and we worked out the pin fit and coating. I really miss visiting with them.


2015 F150 2.7
2018 F350 6.2
Re: Completing your 80% lower receiver manually [Re: Merkava_4] #4105763 05/24/16 08:51 PM
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buck91 Offline
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Would love to build a 80% AR setup, just doubt we should be spending the money. What would one want to budget for this project for a solid, but not fancy, build? Not including tools let say.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: Completing your 80% lower receiver manually [Re: Merkava_4] #4105774 05/24/16 09:10 PM
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hatt Offline
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You can build a pretty respectable AR for $500 in parts. Less with great sale.


2013 F150 5.0, Delo XLE CK-4 10W-30, Baldwin B7449
2010 Camry 2.5, PP 10W-30, Mobil1 M1C-251A
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