double check my AR-15 build please

davsco · Apr 25, 2018

i've built one lower but this will be my first upper. sure i forgot something or a mis-match or there are better alternatives. this will just be a 3 gun backup rifle that i am building a) just to do it and learn how to build one and b) just in case any of those evil black gun bans come to fruition.

Mega upper and 14" extended rifle length keymod rail, 1.6" ID, MKM520HA
Criterion 18" hybrid barrel, .223 Wylde, rifle length gas .750
Seekins low profile adj gas block 11510031 .750od
Brownell's rifle length melonited gas tube
DPMS GAS TUBE ROLL PIN
JP low mass bcg JPBC3SPA
JP comp JPTRE512S875
BCM gunfighter small charging handle

Mega lower gtr-3h
JP low mass recoil buffer JPLMB
JP tuned buffer spring, rifle JPSOSR
DPMS lower parts kit (excl trigger, grip) 60705
Seekins ambi safety 11580012
Seekins enhanced bolt catch 011510057
Brownell's CTR STOCK ASSY COLLAPSIBLE MIL-SPEC
Hogue overmolded beavertail grip 15023
Timney trigger

iH8DemLibz · Apr 25, 2018

Instead of Hogue you should go with a Hogg.

Has a skinny profile and weighs much less.

outrider58 · Apr 25, 2018

It's not so much what you build, but how you build.

2¢

davsco · Apr 25, 2018

outrider58 said:
It's not so much what you build, but how you build.

2¢

if you're saying the assembly details matter, that makes sense, and i welcome any tips, tricks, input etc.

davsco · Apr 25, 2018

iH8DemLibz said:
Instead of Hogue you should go with a Hogg.

dunno, right now "hogg" leaves a bad taste in my mouth, so to speak...

Msteers · Apr 25, 2018

To me looks like you're missing buffer tube, end plate, and nut.

Nice quality setup you got.

NateIU10 · Apr 25, 2018

Msteers said:
To me looks like you're missing buffer tube, end plate, and nut.

Nice quality setup you got.

https://www.brownells.com/rifle-par...stock-kit-gray-sku078000239-66696-143347.aspx

Looks like he has that covered in the parts kit.

chino101 · Apr 25, 2018

I would suggest taking the build class from the School of The American Rifle ( https://www.mdshooters.com/showthread.php?t=188191).

In that class you will have access to gauges to inspect all of your rifle components prior to assembly, but more importantly someone to show you how to use them and interpret the results. Anything out of spec can be corrected on the spot so you won't have to head to the range and wonder if the rifle will work or not or blow up.

In the class that I took, one student purchased a high end Noveske bolt and barrel combo that was supposed to be already head spaced checked, but we found out that wasn't the case when we gauged it; too tight. It was fixed during the class.

rouchna · Apr 25, 2018

davsco said:
dunno, right now "hogg" leaves a bad taste in my mouth, so to speak...

Let me know if you would like me to look at it. I’m no Chad but I did attend his class

RedTide · Apr 25, 2018

davsco said:
dunno, right now "hogg" leaves a bad taste in my mouth, so to speak...

iH8DemLibz said:
Has a skinny profile and weighs much less.

Sounds about right! Does it squeak too?

iH8DemLibz · Apr 25, 2018

RedTide said:
Sounds about right! Does it squeak too?

I would go with: It screeches.

outrider58 · Apr 25, 2018

rouchna said:
Let me know if you would like me to look at it. I’m no Chad but I did attend his class

Along with taking Chad's course, I can also recommend rouchna to take a look. He's close to you, has assembled many ARs, and I will verify his completion of Chad's course with flying colors. He's also a nice as heck guy!

He gets my five thumbs up.

Take it from a creepy ass clown.

rouchna · Apr 25, 2018

outrider58 said:
Along with taking Chad's course, I can also recommend rouchna to take a look. He's close to you, has assembled many ARs, and I will verify his completion of Chad's course with flying colors. He's also a nice as heck guy!

He gets my five thumbs up.

Take it from a creepy ass clown.

Why thank you Sir :thumbsup:

You and your 5 thumbs are good people as well

outrider58 · Apr 25, 2018

rouchna said:
Why thank you Sir You and your 5 thumbs are good people as well

clandestine · Apr 25, 2018

Outrider and Rouchna can certainly assist.

I would advise you to skip that adjustable gas block. They are turds in my experience.

Get an SLR Adjustable.

There are more reliable triggers from Geissele for this application than a Timney

davsco · Apr 25, 2018

clandestine said:
Outrider and Rouchna can certainly assist.

I would advise you to skip that adjustable gas block. They are turds in my experience.

Get an SLR Adjustable.

There are more reliable triggers from Geissele for this application than a Timney

will prob shout out to rouchna since he looks to be a fellow loudounite when i'm ready to put this all together. very nice offer!

ok, will check out SLR, any preference between set screw and clamp-on (the barrel does have a dimple).

yeah i love my geissele's, but "won" this timney so will give it a try.

super thanks to all for input and assistance!

clandestine · Apr 25, 2018

davsco said:
will prob shout out to rouchna since he looks to be a fellow loudounite when i'm ready to put this all together. very nice offer!

ok, will check out SLR, any preference between set screw and clamp-on (the barrel does have a dimple).

yeah i love my geissele's, but "won" this timney so will give it a try.

super thanks to all for input and assistance!

Glad to offer some help. My friends have carried the torch before I even popped in.

Clamp On is less durable but stresses the barrel less than set screws or pinned gas blocks. Less Stress means it's more conductive to accuracy.

Clamp on is best when it's shielded by a floating handguard, in your case it is. It also seals against blthe barrel better than set screw, so less gas bleeding.

Optimum Accuracy = Clamp On

Balanced between Durability and Accuracy = Set Screw

Optimum Durability = Pinned

I would advise to buy the .750 Clamp On for your rail and application, and Rocksett the clamping bolts. Follow the IN# torque instructions and don't under or over tighten.

jrumann59 · Apr 30, 2018

clandestine said:
Glad to offer some help. My friends have carried the torch before I even popped in.

Clamp On is less durable but stresses the barrel less than set screws or pinned gas blocks. Less Stress means it's more conductive to accuracy.

Clamp on is best when it's shielded by a floating handguard, in your case it is. It also seals against blthe barrel better than set screw, so less gas bleeding.

Optimum Accuracy = Clamp On

Balanced between Durability and Accuracy = Set Screw

Optimum Durability = Pinned

I would advise to buy the .750 Clamp On for your rail and application, and Rocksett the clamping bolts. Follow the IN# torque instructions and don't under or over tighten.

Chad couldn't he but a light stake on the clamp on bolts if they are recessed into the gas block. I know when I did my set screw one that I dimpled with a jig I lightly staked the set screws as opposed to "locking" the threads with a chemical.

YerNotGood · Apr 30, 2018

I would choose another barrel. I don't think the one you selected is MD-compliant. It lists the profile as "Hybrid", one of the benefits being that it is lighter than an HBAR. To me, says that its not an HBAR. Look for something specifically stamped "Heavy" or HBAR by the manufacturer. Everything else looks good, have fun!

davsco · Apr 30, 2018

YerNotGood said:
I would choose another barrel. I don't think the one you selected is MD-compliant.

fortunately i'm in VA which at least for the time being is 2a friendly, or at least not 2a hostile. appreciate you looking out for me though!

double check my AR-15 build please

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