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Old 05-09-2013, 08:17 PM   #11
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Looks like you're well on your way to a solid little rifle.

YouTube will be an asset when you go about building the lower. It can be done in 20mins, but I've never done it that fast. Set aside an hour or two, check and double check, and take time to tackle each step properly the first time.

Also- If you want any special options (ie- end plate sling mount), it's always best to sort that out before anything wears Locktite.

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Old 05-10-2013, 06:07 AM   #12
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Tell me why you chose 1 in 7 twist instead of 8 or 9?

As I understand it a 1/7 over spins a 55gr round and it starts to break apart at mid distances.

It's better suited to a 62 - 77 gr round.

I have both a 1:7 AR and a 1:9

I just want to know why you chose 1:7 and if you were aware of what is said about bullet weight

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Old 05-10-2013, 10:40 PM   #13
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Quote:
Originally Posted by mudpupp View Post
Tell me why you chose 1 in 7 twist instead of 8 or 9?

As I understand it a 1/7 over spins a 55gr round and it starts to break apart at mid distances.

It's better suited to a 62 - 77 gr round.

I have both a 1:7 AR and a 1:9

I just want to know why you chose 1:7 and if you were aware of what is said about bullet weight
hmmmmm.

I sent literally thousands of 55gr fmj out of my ARs I have yet to see one break apart on me at any distance.

I seen some keyholing on some rounds on 300+ yard paper targets.

Did this acutally happen to you?
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Old 05-11-2013, 03:54 AM   #14
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I went with the 1:7 because I wanted a true (or as true as possible) M4 upper. I know about the bullet weights and twist because I read the sticky in the AR section. I'm gonna try some 55 gr ammo but I will probably try to find some heavier stuff also. I will test it all and see what works best.

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Old 05-11-2013, 04:49 AM   #15
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Here's another question, based on what I have already posted, will I need any special tools to assemble the lower?

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Old 05-11-2013, 08:03 AM   #16
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Barrel and castle nut????? My upper is already assembled
Your castle nut isn't assembled yet. Castle nut is the ring on your buffer tube.
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Old 05-11-2013, 08:09 AM   #17
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Here's another question, based on what I have already posted, will I need any special tools to assemble the lower?
You need these tools.. take them as an investment. You never know.. maybe you will be infected with BRD like the rest of us.
Some of these tools are pricey, you can get the cheaper ones. They work as good but as i said, take them as an investment. Buy once cry once.

http://www.midwayusa.com/product/363683/grace-usa-roll-pin-punch-set-7-piece-steel

This one is important to prevent detent pins flying around
http://www.midwayusa.com/product/920248/model-1-pivot-pin-detent-installation-tool-ar-15

This one helps alot when putting in roll pin on bolt catch, trigger guard pin and etc.
http://www.midwayusa.com/product/694883/schuster-ar-15-roll-pin-starter-punch-set-2-piece-steel

i used to own those cheap ones but they were not so good. Finally bought this one a month ago and i wished i buy it at the first place.
http://www.midwayusa.com/product/747639/tapco-multi-tool-ar-15

I used to own a suction mobile vise as i don't have a working bench. So i bought this one and i'm amazed
http://www.harborfreight.com/garage-shop/vises/2-1-2-half-inch-table-swivel-vise-97160.html

I don't own this but they are good.
http://www.midwayusa.com/product/310152/promag-armorers-upper-and-lower-receiver-action-block-set-ar-15
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