AR build help
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Old 02-16-2012, 02:43 AM   #1
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Default AR build help

Hello everyone im new to these forums and semi new to the ar 15 world. I was wondering if someone could send me a list of ALL the parts needed to assemble my own ar in either .308 or in the newer aac blackout cartridge if aftermarket parts are available for it. If you could either post her or send me a message that would be awesome. Thank you everyone in advance for the help

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Old 02-16-2012, 03:49 AM   #2
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For .308, you will have DPMS and Armalite based components...most are not interchangeable. .300BLK shares all the components as 5.56 NATO, except for the barrel.

Common parts:

lower:
- lower receiver
- LPK (lower parts kit) (includes- trigger group, grip, bolt catch, magazine release button, safety lever, pivot pins, various roll pins and springs)
- receiver extension kit (includes - receiver extension, action spring, buffer, castle nut, end plate)
- stock or your choice

Upper:
- upper receiver (may or may not include ejection port cover or forward assist)
- barrel
- gas block
- gas tube
- barrel nut
- handguard/rail of your choice
- BCG (bolt carrier group)
- charging handle
- sights and/or optics to suit your needs

May have left something out, but those are the basics. There are variations for many of the above, so shop around. Alternatively, you can build a lower and buy a complete upper.

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Old 02-16-2012, 03:51 AM   #3
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First I have to ask a question about the two calibers you've selected - they are VERY different in range. Would you mind first describing what you want to use this AR for? What are your expectations of each caliber? Have you looked at other options and why rule them out?

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Old 02-16-2012, 11:21 AM   #4
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I would like to eventually build an ar in each of these calibers. The .308 i planto use for hunting/long range recreational shooting. The aac blackout i want as a competition shooting rifle and home defense weapon

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Old 02-16-2012, 11:22 AM   #5
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And thank you very much xmark for the list and information. It will be very helpfull

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Old 02-17-2012, 12:54 AM   #6
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As far as i know the options for an ar are 5.56, 6.8, .308, .300blk, and 7.62x39. I have an ar in 5.56 and i know 7.62x39 doesnt cycle well in the ar platform. I feel 6.8 may be overly expensive for as much as i shoot and my budget. I can get bulk .308 ammo very cheap and it is a good, accurate round. Which appeals very muh to me

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Old 02-17-2012, 01:13 AM   #7
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Quote:
Originally Posted by czwicky View Post
As far as i know the options for an ar are 5.56, 6.8, .308, .300blk, and 7.62x39. I have an ar in 5.56 and i know 7.62x39 doesnt cycle well in the ar platform. I feel 6.8 may be overly expensive for as much as i shoot and my budget. I can get bulk .308 ammo very cheap and it is a good, accurate round. Which appeals very muh to me
6.5 Grendel is an AR15 round, not sure about cost.
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Old 02-17-2012, 01:40 AM   #8
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.308 and .300 BLK will cover all your bases as far as range, hunting, SD. And if you reload you'll be able to use the same bullet unless you get into those specially made .300BLK rounds.

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"The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together."
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Old 02-17-2012, 01:47 AM   #9
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Quote:
Originally Posted by czwicky View Post
As far as i know the options for an ar are 5.56, 6.8, .308, .300blk, and 7.62x39. I have an ar in 5.56 and i know 7.62x39 doesnt cycle well in the ar platform. I feel 6.8 may be overly expensive for as much as i shoot and my budget. I can get bulk .308 ammo very cheap and it is a good, accurate round. Which appeals very muh to me
There are many, many, many more caliber options for the AR...some more boutique than others. If you get a 5.56, moving to .300blk will be as simple as replacing the barrel. A 6.8 upper will also work on a 5.56 lower, but you will need 6.8 mags. Also, if you want the capability to shoot bigger calibers, .450 bushmaster and .458 socom uppers will also work on 5.56 lowers, but you better invest in reloading equipment if you ever plan to get the boutique rounds. So, if you want versatility, I say get a 5.56 to start. If you just want something that will reach out and touch something with oomph, get the .308
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