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My New AR SBR build

Discussion in 'NFA Firearms and Accessories' started by zollen, Apr 2, 2011.

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  1. zollen

    zollen Member

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  2. Sam Cade

    Sam Cade Member

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    If you are going to spend a big chunk of money like that why would you use a Plum Crazy lower?
     
  3. zollen

    zollen Member

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    What's wrong with the composite lower? I like it light weight.
     
  4. Sam Cade

    Sam Cade Member

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    Well, for one thing you won't be able to just drop that nice Geissele trigger in it without replacing the hammer too. :)





    KX3 weighs like half a pound.
     

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  5. zollen

    zollen Member

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    Would you recommend any good hammer for the Geissele trigger
     
  6. Hanzo581

    Hanzo581 Member

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    Looks good, but I do agree, skip the composite lower.
     
  7. bkjeffrey

    bkjeffrey Member

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    Id build it on a Spikes lower..... Id go ahead and fill the lower with a basic DPMS lower parts kit and add your desired trigger group as desired. Everything else you have there looks pretty good. Also, the KX3 is not worth the $100+ that it costs. I speak from experience. Save the cash on the KX3 and it will pay for over half of your stamp.
     
  8. bkjeffrey

    bkjeffrey Member

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    Heres mine when it had the KX3, looks alot like what your building, hope it gives you some inspiration......

    [​IMG]

    After KX3.....Noticeably lighter in the front and not any louder IMO. Is built on Dreadnaught Industries upper and lower with an ASA 7" bbl. total cost just under 700....
     
  9. rooter

    rooter member

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    I wouldn't. Cool logo, but the last few I have built on were sloppily finished. Grinding marks were present and the tolerances seemed excessive. I prefer Stag or RRA lowers.
     
  10. rjrivero

    rjrivero Member

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    bkjeffery.....I dig your sling! Nice work with the Paracord/Square knot design. Must have taken a little time to tie that puppy up!
     
  11. bkjeffrey

    bkjeffrey Member

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    In your price breakdown I didn't see anything for a lower reciever parts kit....$70ish, buffer tube, buffer, buffer spring and reciever castle nut will be needed as well.

    Also, does your upper come complete with bolt, carrier and charging handle? There's a few more bucks to add to you price list too. Just throwing a few things out there for ya to think about.
     
  12. zollen

    zollen Member

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    The C15 composite lower is a complete lower. The entire SBR (without the aimpoint) costs only $1258.
     
  13. Hanzo581

    Hanzo581 Member

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  14. bkjeffrey

    bkjeffrey Member

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    Whatever lower you decide just be sure to use one marked "MULTI" for caliber. On your Form one it is going to ask what caliber. If you register your SBR on a 5.56 marked lower, well.......what if you want to put a 9mm upper on it? Using a "MULTI" lower for an SBR just makes good sense in my opinion.
     
  15. LiquidTension

    LiquidTension Member

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    You...put a 9mm upper on it.
     
  16. TexasRifleman

    TexasRifleman Moderator Emeritus

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    ATF is no longer accepting Form 1's marked "Multi" or "Various" etc for SBRs. They require a specific caliber be on the form. They seem to still be accepting Form 1's with more than one caliber written in however. Same with length. It used to be common to put "less than 16 inches" on the form but those are now being rejected.

    That said, Tech Branch has issued written opinions that say it doesn't matter what is on the Form 1 caliber or length wise. Basically once you get the tax stamp back you have an SBR and the tax stamp allows you to possess the firearm in ANY SBR configuration, regardless of what's on the Form 1.

    The issue seems to come in if you decide to sell the rifle as a complete kit you will need it to be in the same condition as the Form 1 says, length and caliber. That is an ATF agents verbal opinion to a dealer I know, I have never seen that one in writing.

    There is no law against having an SBR in a configuration that does not agree 100% with the Form 1 as far as length and caliber go.

    The same is true of Title 1 firearms. If I own a 24 inch rifle and I cut the barrel down to 20 inches, that does not change the Title 1 status of the firearm and I don't have to notify anyone.

    No difference here. A 5.56/11" SBR can be turned into a 9mm/7" SBR without any paperwork. It's still an SBR.

    Tech Branch has also said that the caliber markings on the lower do not have to match the caliber of the installed upper. The Form 1 just wants to know what is engraved on the lower for identification purposes. Again for a Title 1 firearm this would be the same thing. Reaming out a bolt action rifles chamber to accept another caliber does not require the markings to be changed. Putting a 20 inch 6.8 upper on a Title 1 lower marked 5.56 is perfectly legal.
     
  17. Aaron Baker

    Aaron Baker Member

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    Good info in this thread.

    To the original poster: sounds like a nice SBR, but I'd take the advice given in this thread and skip the Plum Crazy lower. Yes, in theory, a composite lower sounds nice because it's lightweight. However, there's at least one picture posted in this thread already of a broken composite lower. I'm not going to say that's common with PCF lowers, because I don't honestly know. But I will say that they haven't been around long enough and torture tested thoroughly enough for ME to use one on an SBR build.

    What you should realize is that once your SBR is built, you can't change lowers. That PCF lower will always be a Title II firearm. If it breaks, you're out a $200 tax stamp. And you still have to go through the hassle of notifying the ATF and having it removed from the registry, because otherwise you've got a paperweight that it's a federal crime to improperly dispose of or let anyone else take possession of.

    Buy a quality lower, and save weight somewhere else.

    Aaron
     
  18. devinsdad

    devinsdad Member

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    Aaron beat me to the punch. Make sure you use a good quality lower cause if it does break, you're out the $200. Don't forget to factor in the cost of engraving it as well, figure $60-80 depending who you have do it. And again, drop the KX3, the weight alone should rule it out. People think they look cool but after a few strings offhand with that chunk of steel out there, you curse the day you bought it.
     
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