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Thread: SPR Build, Thoughts...

  1. #1
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    SPR Build, Thoughts...

    Hey gents... I am getting ready to put a new rifle together... It will be an SPR (Not MK12). I was curious to hear thoughts on the parts list and get some feedback on what I should change etc.

    Seekins Billet Upper and Lower
    Fortis 14" Rail
    Magpul STR with Battle Line SAPR
    A5 Tube
    JP Buffer & Spring
    18" Compass Lake Krieger SRP 1:7 Barrel (Cut to my bolt)
    Seekins BCG
    Random LPK (probably DPMS)
    Atlas Bipod
    Lantac Break
    Geissele SD-E Trigger
    A-Peg Grip
    Vortex Razr 1-6 Optic

    Some of this stuff has been layin around my shop and need to be put on something or sell it. For what I have, I thought an SPR made the most sense... I am sure I am going to get a lot of folks saying go with a different rail but, that is one of the things I have laying around (along with the Seekins and trigger parts).


    Love to hear thoughts!

  2. #2
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    Would personally, going by what you are putting into this build, go with a bit higher quality LPK. Also, would lean towards a BCM BCG, again personal thing but BCM is generally considered to be one of the top ones on the market and unless you really need the low mass the BCM is going to be cheaper.

    No idea on the spring and buffer since I was under impression that the A5 system used its own spring and buffer.

    Those are the only things I would look into at the moment, other than that the only other things are straight personal/ergo preference between you and me.
    "I don't collect guns anymore, I stockpile weapons for ****ing war." Chuck P.

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  3. #3
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    I think your parts and idea are sound but Ill echo Kain. Better LPK and a good trigger will suit your intended purpose. Geiselle is a thought

    I have no experience with low mass BCG, but I know a standard known quality BCG will be fine.

    A5 kit has spring and buffer with it.

    Othe Ethan that it going to come down to personal preference.
    Last edited by fixit69; 09-28-14 at 19:02.
    "You cannot play fair with people who don't care if you get wiped off the map. You don't have to hate everyone who isn't part of your tribe, but it is foolish to keep caring about people who don't care about you."
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    See you soon, AC.

  4. #4
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    I'd be careful with the JP buffer and spring if they are not for an AR10. Normal AR15 buffer and springs, will not work with the A5.

    1. Can I use a carbine spring and buffer kit with the RE-A5?

    You cannot. The use of a carbine spring and buffer with the RE-A5 receiver extension could result in damage to your firearm. The RE-A5 receiver extension is designed to only work with other VLTOR A5 components which can be purchased separately.
    http://www.vltor.com/product/re-a5-a...ver-extension/
    Last edited by Zane1844; 09-28-14 at 19:38.
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  5. #5
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    Quote Originally Posted by fixit69 View Post
    I think your parts and idea are sound but Ill echo Kain. Better LPK and a good trigger will suit your intended purpose. Geiselle is a thought

    I have no experience with low mass BCG, but I know a standard known quality BCG will be fine.

    A5 kit has spring and buffer with it.

    Othe Ethan that it going to come down to personal preference.
    He already got the Geiselle trigger brother. Like I said, most of his gear is pretty top notch, just a few areas where I think he might be better served by spending a couple more bucks, or in regards tot eh BCG a few less.

    With the A5 I need to go back and reread up on it, was going to put one on my latest build, and understood you couldn't run a carbine buffer in it or spring, but after shooting it the rifle it is so smooth I am loath to change anything other than my light mount and rock on. So OP do make sure you research that if it doesn't get answered explicitly here because it could cause issues/damage.
    "I don't collect guns anymore, I stockpile weapons for ****ing war." Chuck P.

    "Some days you eat the bacon, and other days the bacon eats you." SeriousStudent

    "Don't complain when after killing scores of women and children in a mall, a group of well armed men who train to shoot people like you in the face show up to say hello." WillBrink

  6. #6
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    Yes. I am a bit wore out from long hours l, didn't register the trigger.

    The A5 kit has reciever extention, spring and buffer. You cannot use a carbine RE, spring and buffer or damage is said to occur. I tend to believe them.

    Check out the A5 if you get a chance. It definately changed my mind, couple it with a mid length gas and it is really soft.
    "You cannot play fair with people who don't care if you get wiped off the map. You don't have to hate everyone who isn't part of your tribe, but it is foolish to keep caring about people who don't care about you."
    Speech at the second National Policy Institute conference, December 26, 2013.



    See you soon, AC.

  7. #7
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    Good stuff here... I already have the Seekins BCG, so that it going to stay! I will get a decent LPK but, the Seekins receivers do not need most of the parts in it.

    Additionally, I will probably just get the JP silent captured spring instread of the A5 tube and buffer. I think its a nicer set up and a bit more quiet.

    Last... Ill be going with a rifle gas system...

  8. #8
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    Wait wait, the JP silent capture ships with a spacer so that you can use it with a rifle length extension, won't that make it compatible with the A5?? I was under the impression that the A5 is a rifle receiver extension.

  9. #9
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    Quote Originally Posted by fixit69 View Post
    Yes. I am a bit wore out from long hours l, didn't register the trigger.

    The A5 kit has reciever extention, spring and buffer. You cannot use a carbine RE, spring and buffer or damage is said to occur. I tend to believe them.

    Check out the A5 if you get a chance. It definately changed my mind, couple it with a mid length gas and it is really soft.
    Lol. Yeah, I hear you, was at a shoot for the past two days. Am drinking a couple beers and crashing here shortly.

    I know I should. Will likely wait until I get to shoot one though before I decide to spend money on it. Unless I decide to go to an SPR like the OP's at which point I really think it would be of benefit in reliability while also allowing me use of a collapsible stock. But my Current BCM build with a middy gas system, Larue rail, ect, with an A2 shoots softer than an RRA heavy barrel 20 inch varminiter that I have.

    Quote Originally Posted by cundiff5535 View Post
    Good stuff here... I already have the Seekins BCG, so that it going to stay! I will get a decent LPK but, the Seekins receivers do not need most of the parts in it.

    Additionally, I will probably just get the JP silent captured spring instread of the A5 tube and buffer. I think its a nicer set up and a bit more quiet.

    Last... Ill be going with a rifle gas system...
    Have used a JP lpk for like $36 from Rainier that lacks the trigger group. Otherwise would be tempted to say to hell with it and buy all the parts individually from brownells or somewhere. Not saying the DPMS couldn't work, but after stripping a DPMS lower earlier this year and comparing parts and their quality to Colt parts and the JP parts there is enough difference that I would spend a couple extra bucks.
    "I don't collect guns anymore, I stockpile weapons for ****ing war." Chuck P.

    "Some days you eat the bacon, and other days the bacon eats you." SeriousStudent

    "Don't complain when after killing scores of women and children in a mall, a group of well armed men who train to shoot people like you in the face show up to say hello." WillBrink

  10. #10
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    Quote Originally Posted by Kain View Post
    Have used a JP lpk for like $36 from Rainier that lacks the trigger group. Otherwise would be tempted to say to hell with it and buy all the parts individually from brownells or somewhere. Not saying the DPMS couldn't work, but after stripping a DPMS lower earlier this year and comparing parts and their quality to Colt parts and the JP parts there is enough difference that I would spend a couple extra bucks.
    Ill probably just buy the JP kit then

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