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Thread: Modern Sporter - Build Discussions

  1. #1851
    Business Member Rep. ATRS Shaun's Avatar
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    Quote Originally Posted by deadman View Post
    Dilligaf: I used the tube I had because when I started I (maybe mistakenly) thought it was a direct transfer of parts to receiver. Only after it was done found out some have had an issue, which is why I asked my question. Just trying to learn.

    ATRS Shaun: As for the statement that its NOT an AR, I get that. Was only looking at my Colt for a comparison of the internal parts in relation to each other. Again, here to try to learn.

    What I get from this is: if clearances are good, a failure in function at this point would be a gas/buffer issue.
    That is my opinion, now if you could not clear the bolt catch manually, I'd start to wonder some more

  2. #1852
    Member Qwerty1zer's Avatar
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    On the topic of forward assists, looking to replace the out of spec TNA one I have that rubbed the roll pin. (at least I hope its not the receiver)
    I'm assuming most other "name brand" FA's work fine but has anyone tried Radian's FA in either Ti of Al?

  3. #1853
    CGN Ultra frequent flyer deadman's Avatar
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    Quote Originally Posted by ATRS Shaun View Post
    That is my opinion, now if you could not clear the bolt catch manually, I'd start to wonder some more
    Thank you. Everything checking out so far, now I need to get out and shoot it.

  4. #1854
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    I picked up the Aluminum Radian Forward assist and it protruded too far into the receiver to function properly. Ended up replacing it with a modified strike industries forward assist.

    Quote Originally Posted by Qwerty1zer View Post
    On the topic of forward assists, looking to replace the out of spec TNA one I have that rubbed the roll pin. (at least I hope its not the receiver)
    I'm assuming most other "name brand" FA's work fine but has anyone tried Radian's FA in either Ti of Al?

  5. #1855
    CGN Ultra frequent flyer G.Mitchell's Avatar
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    I’m reading many questions about magazine compatibility, any chance the third run will address the issue with gen 3 PMAGS and other mags not fitting or fitting too tightly?
    Looking for members in Grande Prairie Alberta interested in wilderness skills, survival skills, camping, prepping, shooting, etc.

  6. #1856
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    Quote Originally Posted by ATRS Shaun View Post
    This is NOT an AR15.

    Has a single person come back with the issue that there bolt carrier won't clear the bolt catch?

    No, you're all just saying "it doesn't clear it by as far as my ar15 does".
    What I mean is, I know it's not an AR, but you're designing it to use AR parts right? If you're marketting this product to take AR parts, unless compromises needed to be made for another critical area, wouldn't you want to check and maximize compatibility?

    Here's the actual problem. Yes my bolt does clears the bolt catch if you charge the BCG on an empty magazine. However, at two occasions(and this is my guess), my well used magazines(dirty?) actually weren't strong enough to push the bolt catch to catch the bolt after the last round in time. However these mags do function normally on my other ARs and Tavors. My guess is that in this case, more margin(more space and BCG travel time) might have given the magazine spring a better chance to push it up.

    Has a single person come back with the issue that there bolt carrier won't clear the bolt catch?
    Using this logic, we also talked about the ejection port door, it's the same thing. If there's no other constraints, why wouldn't you want to mimic how far the port door closes to maximize compatibility? I know brownell's lightweight carrier wont push it open.

    It's all in good faith, and I admire your operation and it must be a nightmare to handle everything. All I'm saying is to check these particular dimensions may only consume a small amount time but just a one-time-thing, and you probably don't need a "parts compatibility thread". People like myself wouldn’t need to trial and error parts compatibility, like the few brownell's lightweight carriers I bought but ended up selling at a loss.

    If you ever decide to improve on the next run, I'd love for you guys to:
    1.) Mill the buffer detent hole a little more towards the rear, even if it creates a half moon notch where the charging handle rides, so the carrier travel length is exactly the same as mil spec (It'll be covered anyway)
    2.) Have ejection port door close at the same angle as a mil-spec AR, so lightweight carriers from brownell's can be used.
    Last edited by PinaKaleada; 01-20-2020 at 06:48 PM.
    I want you to be pleased with your purchase, so do not hesitate one bit to ask questions before purchase! If we do decide to go forward with payment, I assume that you are satisfied with all info provided before payment. This is a polite as-is disclaimer. Transfers can be sent to pina*******@gmail.com (see my full name for actual email)

    I ship at least once a week on my day off.

  7. #1857
    Super GunNutz jiffx2781's Avatar
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    Quote Originally Posted by G.Mitchell View Post
    Im reading many questions about magazine compatibility, any chance the third run will address the issue with gen 3 PMAGS and other mags not fitting or fitting too tightly?
    No issue with gen3 p-mags

    "Arguing with idiots is like playing chess with a pigeon..... No matter how good you are, the bird is going to s#!t on the board and strut around like it won anyway."

  8. #1858
    CGN Ultra frequent flyer G.Mitchell's Avatar
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    Quote Originally Posted by jiffx2781 View Post
    No issue with gen3 p-mags

    Nice! Why are there so many other comments on mag compatibility and gen 3 mags?
    Looking for members in Grande Prairie Alberta interested in wilderness skills, survival skills, camping, prepping, shooting, etc.

  9. #1859
    Super GunNutz jiffx2781's Avatar
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    Quote Originally Posted by PinaKaleada View Post
    What I mean is, I know it's not an AR, but you're designing it to use AR parts right? If you're marketting this product to take AR parts, unless compromises needed to be made for another critical area, wouldn't you want to check and maximize compatibility?

    Here's the actual problem. Yes my bolt does clears the bolt catch if you charge the BCG on an empty magazine. However, at two occasions(and this is my guess), my well used magazines(dirty?) actually weren't strong enough to push the bolt catch to catch the bolt after the last round in time. However these mags do function normally on my other ARs and Tavors. My guess is that in this case, more margin(more space and BCG travel time) might have given the magazine spring a better chance to push it up.
    I think it's reasonable to say that you guess correctly. With less than 1/8" of travel (my rifle length tube allowed for 3/32" travel) past the bolt catch everything else has to be running 110% to guarantee 100% function.

    Denying the plausibility (Shaun) of bcg travel effecting function, specifically LRBHO, and instead suggesting to remedy it by reducing buffer spring strength/resistance and/or suggesting inadequate gas port size (aka, suggesting increasing gas volume) is only a bandaid remedy to what's actually happening.


    Quote Originally Posted by PinaKaleda View Post
    Using this logic, we also talked about the ejection port door, it's the same thing. If there's no other constraints, why wouldn't you want to mimic how far the port door closes to maximize compatibility? I know brownell's lightweight carrier wont push it open.

    It's all in good faith, and I admire your operation and it must be a nightmare to handle everything. All I'm saying is to check these particular dimensions may only consume a small amount time but just a one-time-thing, and you probably don't need a "parts compatibility thread". People like myself wouldn’t need to trial and error parts compatibility, like the few brownell's lightweight carriers I bought but ended up selling at a loss.

    If you ever decide to improve on the next run, I'd love for you guys to:
    1.) Mill the buffer detent hole a little more towards the rear, even if it creates a half moon notch where the charging handle rides, so the carrier travel length is exactly the same as mil spec (It'll be covered anyway)
    2.) Have ejection port door close at the same angle as a mil-spec AR, so lightweight carriers from brownell's can be used.
    Simply relocating the buffer retainer pin rewards will do nothing to increase total bcg travel. The entire buffer tube itself has to move rewards if you're going to achieve a gain in length of travel.

    Carbine length tubes can be played with to a limited extent simply by how far you screw it into the receiver. As pointed out previously, tubes (like the PWS) with an extended area where the buffer retainer pin goes will allow you to gain the most length because they don't have to be screwed into the receiver as far to be able to catch the retainer pin.

    Rifle length tubes like I used for one build are fixed and don't allow any adjustability. You either use it and if it works you carry on or you have to do like I did and remove a bit of material from the rear of the buffer pad to gain the extra length.



    I don't see the reduced bcg travel as being a really big deal as in most cases things are probably going to still work fine. However if it is an issue to someone for some reason a little bit of playing around and checking adjustments during assembly is all it takes to gain a little extra of that lost travel back.
    "Arguing with idiots is like playing chess with a pigeon..... No matter how good you are, the bird is going to s#!t on the board and strut around like it won anyway."

  10. #1860
    Super GunNutz jiffx2781's Avatar
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    Quote Originally Posted by G.Mitchell View Post
    Nice! Why are there so many other comments on mag compatibility and gen 3 mags?
    Don't know, maybe some people are legitimately having fitment issues. All I can say is I bought several receiver sets and mine all work as good as the one I posted.
    "Arguing with idiots is like playing chess with a pigeon..... No matter how good you are, the bird is going to s#!t on the board and strut around like it won anyway."

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