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Thread: Where is the weak point in this setup?

  1. #21
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    Quote Originally Posted by Gooch_ View Post
    Hey guys
    I'm new here and wanted some opinions on where I can afford to make some changes in my build. This is my first AR and it has been coming together for about a year now.

    Like many others I'm on a budget and have gone to great lengths to do my research and when possible to spend my money where it counts.

    I feel like my weak point is my buffer system, and trigger. I bought them because they were a great deal and the guy at the shop told me they were "mil-spec". This was almost a year ago and I now know they are pretty important. Can anyone with a similar setup shed some light on any performance issues I might be looking at and what they did to fix them?

    Aero precision lower
    Aero precision upper
    Aero precision barrel 14.5" 1-7 twist
    Aero gas block/tube
    No name buffer/spring/6 position tube
    No name lower parts kit


    Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.
    -Robert E. Howard
    The way I see it is, one of the weak spots may lie with your no name 6-pos. buffer tube. Is it a Mil-Spec or commercial buffer tube? Regardless, I would recommend swapping it out with a BCM Mil-Spec 7075T6 6-pos. buffer tube. If your is already comparable to their's, keep it. The LPK is not so big a concern. What type of BCG are you planning on using (M16 or semi-auto)? I recommend using a M16 type BCG. Additionally, is the buffer a standard one or a "H" (heavy). If your barrel has a carbine length gas system, I recommend going with a "H" or maybe a "H2" buffer. If it has a mid-length gas system, you can stay with a standard buffer or use a "H" buffer.

    I have a 14.5" Mid-length build I did earlier this year. Here are some of the specs on it.

    Upper Receiver:

    TGD Firearms Billet upper receiver (made by New Frontier Armory)
    AIM Surplus NiB M16 Bolt Carrier Group
    BCM Gunfighter Charging Handle w/ Mod 4 latch
    BCM Standard 14.5" Mid Length Barrel, Stripped
    BCM Low Profile Gas Block (steel with set screws) .750
    Midwest Industries 12-inch Gen2 SS-Series One Piece Free Float Handguard - BLACK
    Midwest Industries G2SS PANEL KIT (FDE)
    JP Enterprises Compact Tactical Comp with Persuader Front End
    MAGPUL MBUS front and rear sights
    Aimpoint PRO

    Lower Receiver:

    TGD Firearms Billet lower receiver (made by New Frontier Armory)
    PSA LPK w/ B5 Systems Pistol Grip (FDE)
    ALG ACT Trigger
    BCM 4-Position Mil-Spec Buffer Tube Assembly (standard carbine buffer)
    B5 Systems SOPMOD stock (Mil-Spec)
    Seekins Extended Bolt Release
    Seekins Magazine Release




    With the 14.5" mid-length barrel, NiB BCG, and the standard buffer, the system runs very smooth. So smooth that the first time I shot it I could not tell if the next round chambered or not. I had to visually check. It is probably one of the smoothest shooting AR s I have.
    "A Bad Day At The Range Is Better Than A Great Day Working"

    USMC Force Recon 1978-1984
    US Air Force Res. 1995-2004 (Air Transportation)
    M16/AR15 shooter since 1978, gun collector and AR builder since 2004
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  2. #22
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    Quote Originally Posted by TXBK View Post
    I would roll with it then, but you should know that the bolt is the weak part of that setup.
    I'm curious as to why you say so.

    Quote Originally Posted by Renegade04 View Post
    The way I see it is, one of the weak spots may lie with your no name 6-pos. buffer tube. Is it a Mil-Spec or commercial buffer tube? Regardless, I would recommend swapping it out with a BCM Mil-Spec 7075T6 6-pos. buffer tube. If your is already comparable to their's, keep it. The LPK is not so big a concern. What type of BCG are you planning on using (M16 or semi-auto)? I recommend using a M16 type BCG. Additionally, is the buffer a standard one or a "H" (heavy). If your barrel has a carbine length gas system, I recommend going with a "H" or maybe a "H2" buffer. If it has a mid-length gas system, you can stay with a standard buffer or use a "H" buffer.

    I have a 14.5" Mid-length build I did earlier this year. Here are some of the specs on it.

    Upper Receiver:

    TGD Firearms Billet upper receiver (made by New Frontier Armory)
    AIM Surplus NiB M16 Bolt Carrier Group
    BCM Gunfighter Charging Handle w/ Mod 4 latch
    BCM Standard 14.5" Mid Length Barrel, Stripped
    BCM Low Profile Gas Block (steel with set screws) .750
    Midwest Industries 12-inch Gen2 SS-Series One Piece Free Float Handguard - BLACK
    Midwest Industries G2SS PANEL KIT (FDE)
    JP Enterprises Compact Tactical Comp with Persuader Front End
    MAGPUL MBUS front and rear sights
    Aimpoint PRO

    Lower Receiver:

    TGD Firearms Billet lower receiver (made by New Frontier Armory)
    PSA LPK w/ B5 Systems Pistol Grip (FDE)
    ALG ACT Trigger
    BCM 4-Position Mil-Spec Buffer Tube Assembly (standard carbine buffer)
    B5 Systems SOPMOD stock (Mil-Spec)
    Seekins Extended Bolt Release
    Seekins Magazine Release




    With the 14.5" mid-length barrel, NiB BCG, and the standard buffer, the system runs very smooth. So smooth that the first time I shot it I could not tell if the next round chambered or not. I had to visually check. It is probably one of the smoothest shooting AR s I have.
    Okay it is a midlength system 14.5" barrel. I do believe the buffer is a standard carbine buffer. everything is mill spec dimensions but as to the quality or manufacturer I'm not so sure. As someone stated before it probably is a DPMS buffer tube kit.

    I'm essentially building the same system that you have with different parts so I'm pleased to hear yours runs well. I'm about to get to the UPS store to pick up the remainder of the parts and I'll get a rough mockup today before I lock tight and torque everything to spec. I'll post some pics later.


    Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.
    -Robert E. Howard
    “Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.”

    ― Robert E. Howard

  3. #23
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    Quote Originally Posted by MistWolf View Post
    You wanna know what the weak points are on your rifle, go shoot it
    Quote Originally Posted by fbody93 View Post
    +1

    I think the OP might be overthinking things a bit. Go shoot the crap out of this rifle, and when you have a problem surface, replace it with a "higher end" part.

    Here's my short list of things to worry about:

    Extractor breaking
    Gas rings on bolt (wear item)
    Gas key loosening on carrier from poor staking
    Broken hammer
    Poor quality ammo

    This is what I've seen. You could gather a spare trigger group, bolt, some gas rings, and be GTG. Replace parts when they wear out.

    #1 priority here though is just go shoot the crap out of it just the way it is.

    Greg
    Yeah based on what I've read here I'm going to get this thing together and put some rounds through it and see what happens.


    Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.
    -Robert E. Howard
    “Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.”

    ― Robert E. Howard

  4. #24
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    Where is the weak point in this setup?

    Here is the full parts list...sorry I know this should have been in the OP

    LOWER:
    Aero gen I lower
    Unknown lower parts kit
    Mil-spec buffer assembly(unknown)
    Magpul CTR buttstock
    ERGO AR grip
    Core 15 oversized trigger gaurd


    UPPER:
    Aero M4E1 upper receiver
    Aero nickel boron BCG
    Aero 14.5" 5.56 barrel w/ midlength gas system
    Aero Enhabced Keymod handgaurd 13"
    Aero standard Charging handle
    PWS FCS556 comp


    Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.
    -Robert E. Howard
    “Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.”

    ― Robert E. Howard

  5. #25
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    The specs on their NiB bolt show that they do not use the correct Mil-Spec Carpenter No. 158 steel. NiB BCG Specs

    I have found second-hand responses on the internet that they individually test each unit, but other than the company from which they source them, who knows.
    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  6. #26
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    Quote Originally Posted by TXBK View Post
    The specs on their NiB bolt show that they do not use the correct Mil-Spec Carpenter No. 158 steel. NiB BCG Specs

    I have found second-hand responses on the internet that they individually test each unit, but other than the company from which they source them, who knows.
    These are features for the Aero Precision NiB BCG.

    Features

    -Machined from 8620 Tool Steel (Carrier) and 9310 Carpenter Steel Bolt

    -Shrouded firing pin

    -Nickel Boron Coating inside and out (Bolt, Carrier, and Gas Key

    -Forged Mil-Spec gas key attached with Grade 8 hardware and Properly staked

    -5.56 Bolt is shot Peened and MPI

    -Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring

    -Tool Steel Extractor

    -High quality BCG

    The fact that it does not have a bolt made from Carpenter No. 158 steel is not an issue. 9310 Carpenter steel is about 8% stronger that C158. C158 is mil-spec because that is what the TDP stipulates. 9130 steel cost a little more and that is probably why the military chose C158 instead. Both have excellent properties and work very well. Also, remember that mil-spec is the minimum standard that the military accepts. A 9310 bolt goes above that, but not by much.
    "A Bad Day At The Range Is Better Than A Great Day Working"

    USMC Force Recon 1978-1984
    US Air Force Res. 1995-2004 (Air Transportation)
    M16/AR15 shooter since 1978, gun collector and AR builder since 2004
    Oath Keeper member
    III% United Patriots member

  7. #27
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    I'd say the buffer tube is your weak link. If you want to upgrade something, I'd start by replacing it with one you know is 7075. PSA has one for $30: http://palmettostatearmory.com/index...t/view/id/5942 I wouldn't worry about the trigger, at least from a reliability/durability standpoint. As long as it is properly surface hardened, it will be fine. I would run the carbine buffer and not worry about it unless you see reliability issues. The 14.5" middys are not known for being overgassed... usually the opposite if anything... so unless it has an oversized gas port or something, you should be fine with a carbine buffer.
    "This motto may adorn their tombs
    (Let tyrants come and view):
    We rather seek these silent rooms
    Than live as slaves to you."

    Lemuel Haynes, 1775

  8. #28
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    Quote Originally Posted by Renegade04 View Post
    The fact that it does not have a bolt made from Carpenter No. 158 steel is not an issue. 9310 Carpenter steel is about 8% stronger that C158. C158 is mil-spec because that is what the TDP stipulates. 9130 steel cost a little more and that is probably why the military chose C158 instead. Both have excellent properties and work very well. Also, remember that mil-spec is the minimum standard that the military accepts. A 9310 bolt goes above that, but not by much.
    This is a topic that has been discussed and debated many times, and not using C158 may not be an issue. The fact of the matter is, that the companies that sell the best bolts use C158, and that is pretty good indication on what should be used. It is not safe to say that 9310 goes above Mil-Spec.
    To educate a man in mind and not in morals is to educate a menace to society. --Theodore Roosevelt--

  9. #29
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    9310 accepts alternate treatments/coatings better than c158 such as NiB and Melonite.
    I paint spaceship parts.

    Quote Originally Posted by Failure2Stop View Post
    Stippled Glocks are like used underwear; previous owner makes all the difference in value.

  10. #30
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    Well....guys Aero sent my order out with no gas block. The invoice has them marked out of stock.

    Another issue I found my front pivot pin won't go in with the upper in place. It can be tapped in and out without the upper in place but not with. I didn't want to resort to the hammer so I figured I would let it be until I can get some feedback from you guys. Any thoughts?


    Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.
    -Robert E. Howard
    “Civilized men are more discourteous than savages because they know they can be impolite without having their skulls split, as a general thing.”

    ― Robert E. Howard

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