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Thread: Cherry pick the TDP

  1. #21
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    If you are going to change the bolt that much, you can just use a larger diameter one - like halfway toward what Remington did with the 30 RAR. If this happened, then finally 7.62x39mm would stop breaking bolts.

  2. #22
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    Quote Originally Posted by Littlelebowski View Post
    Lose a lug on the bolt, make the remaining ones bigger and stronger.
    You talkin 7 lug pattern?

    Does anything currently use this?
    Last edited by Clint; 05-31-11 at 11:57.
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  3. #23
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    Quote Originally Posted by Clint View Post
    You talkin 7 lug pattern like on the SCAR?
    Aye, sure am.

  4. #24
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    Quote Originally Posted by BrigandTwoFour View Post
    5. Easily changed barrels/fore end units. Getting into the really out there conceptual stuff. It would make sense to me that a truly modular rifle could be configured for any mission. We know this can be accomplished by switching uppers on the fly, but what if we reduced that even further down to just the barrel and forearm? Joe could go from a CQB MK18 profile up to a 18" SPR profile in just a few seconds while keeping the same upper receiver and trigger, a forearm and barrel assembly alone certainly takes up less space and weight than a complete upper receiver with separate optics platform.
    That doesn't make much sense to me. If you changed the barrel on your Mk18 to a Mk12, you would still have an aimpoint on the upper receiver.

  5. #25
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    Quote Originally Posted by Hayden Billick View Post
    That doesn't make much sense to me. If you changed the barrel on your Mk18 to a Mk12, you would still have an aimpoint on the upper receiver.
    I'm also skeptical of the return to zero on QD barrels. Replacing the whole upper is the way to go. I think Colt has embraced this with the CM901. I also have the impression that the QD barrels add weight to the rifle.

  6. #26
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    Quote Originally Posted by Robb Jensen View Post
    For the M4 carbine, Things I would change:

    1. Use a 16" barrel, 1x8 twist midlength cold hammer forged 11595-E steel barrel.
    2. Crane LMT/KAC SOPMOD or VLTOR E-Mod stock to replace M4 stock both are stronger and better than the M4 stock.
    3. KAC E3 style barrel extension and KAC style E3 bolt. Both have proven to last at least 4-5 times longer than Colt style AR/M4 bolts.
    4. Standard charging handle replaced with Type 4 or 5 BCM/VLTOR Gunfighter charging handles.
    5. CAR receiver extensions replaced with VLTOR A5 extensions and VLTOR 5oz standard A5 buffers. Buffer springs would share the same part number as the M16A2, A3 and A4 buffer springs.
    6. Finish on gas tubes, barrel extensions, carrier keys, bolt carriers, cam pins, ejectors, extractors & extractor and ejector pins, firing pins, hammers, triggers and disconnectors, safety/selectors, take down pin detents, safety/selectors detents and interior of inner of metal magazines and the inner and outer surfaces of upper and lower receivers replaced with a nickel boron finish.
    This is it right here.

    I've been thinking of #6 lately as a possible next project. If you do #6 you will be able to dial down the gas beyond current standards and still have reliable operation. Less gas doing the same job makes DI better on every level.

    I would add
    KAC mid length gas on the 16" barrel

  7. #27
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    Something I wrote a year or so back on another forum:

    I'll preface this post by saying this: None of what I'm outlying indicates any sort of, 'deal breaker' for the AR/M-16 by any means so please do not construe it as such.

    Now if we're talking actual improvements to the system itself as opposed to solely add-on stuff (or bullshit like piston conversions), there are a couple things that could be done:

    Increase extractor size.
    Maybe 30% larger or so (knee-jerk. Let some engineers actually do the math). As we shorten the barrel (and more importantly, the gas system), extractor tension becomes more paramount due to the increased violence of the action. New inserts and springs help this greatly but if we increased the overall size of the extractor we wouldn't need add-on's. For those that are going to naysay Stoner for having the extractor it does, remember that when he developed the system it was around a 20" barrel with a rifle length gas system.

    Adjustable or Self-Regulating gas port (preferably the latter).
    Would also quash any sort of issues that shorter gas systems have introduced. Gas port erosion has been referred to by some as a, 'self regulating' issue because as the gas port erodes it also traps more carbon, mitigating the issue somewhat. Still isn't enough since the ROF can increase by nearly 50% on older rifles as opposed to new ones.

    Ambidextrous controls standard.
    The KAC SR-15 series does this very well. Instead of a bunch of add-on crap they actually have it built into the receiver design. As it stands: boutique rifle. I invariably advocate left hand shooters learn to deal with a right hand rifle without any added crap but if it were standard then there wouldn't be any need for, 'work arounds'

    Better, stronger, standard buttstock.
    Looks like the Marine Corps might be going in the right direction with this one. In times of plate carriers and other shit it's really needed.

    Higher quality BUIS.
    nuff' said.

    Free Floating Rail System.
    Yes, some specific rifles (such as the SAM-R) come equipped with free-floating rail systems but I'd like to see them across the board. One of the reasons this isn't implemented now is because most FF rails preclude mounting an M203 launcher anywhere near to the bore of the rifle (even with the non-FF tubes, it ain't exactly super-close). Maybe give the armorers a little more work and have them switch out rail systems if a rifle is going to have an M203 mounted.

    Eliminate any, 'Burst' FCG
    Burst FCG = shitty trigger. Stick to standard FA FCG's.

    Ambidextrous charging handle and/or forward CH
    The entire reason why the CH is where it is on the AR/M-16 is because the design initially included a CH underneath the carry handle. The design proved to be a weak point so the CH was moved to the rear. Better ergonomics = faster manipulations (assuming the same amount of training.)

    Decrease in number of locking lugs and increase in physical size
    Ala' FN SCAR, not Sig556

    Heavier Barrel
    ..some people, especially trendy people, won't like this one...

    More sling attachment points
    Would allow for a greater variety of slings. Somewhat self-explanatory.

    Better BCG/internal coating
    Yah yah, we all know I advocate FailZero. However, many coatings are better than the standard we currently have, namely: Ion-bonding, hard chrome, or FZ. They allow for stretching of lubrication.

    RFIDs
    No, not adding anything electronic that the weapon depends on to run. Rather, RFIDs that count number of rounds through the weapon. A separate system would allow for annotations when parts failed and/or were replaced. This would allow for us to be something that most units are never about weapons maintenance: Proactive. It's a novel idea which means that big army will likely ignore it


    Anyone else notice that, 'gas piston!!!!' wasn't part of the list? Once again, I reiterate that nothing I outlined above means that the AR/M-16 is anything less than a good, capable weapons system. None of it. If I were starting from scratch, knowing what we know today, the above are things I would change and/or implement.
    Last edited by Dave_M; 06-01-11 at 02:19.
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  8. #28
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    Quote Originally Posted by Dave_M View Post
    Higher quality BUIS.
    nuff' said.

    RFIDs
    No, not adding anything electronic that the weapon depends on to run. Rather, RFIDs that count number of rounds through the weapon. A separate system would allow for annotations when parts failed and/or were replaced. This would allow for us to be something that most units are never about weapons maintenance: Proactive. It's a novel idea which means that big army will likely ignore it


    Anyone else notice that, 'gas piston!!!!' wasn't part of the list? Once again, I reiterate that nothing I outlined above means that the AR/M-16 is anything less than a good, capable weapons system. None of it. If I were starting from scratch, knowing what we know today, the above are things I would change and/or implement.
    I thought there were a number of different BUISs. I guess the 'standard' is the MaTech but there are others in the system.

    Nothing can make people proactive. Standard maintenance usually doesn't get performed, I can see RFIDs costing tons of money and no one ever looking at round counts except to fill out paperwork.

  9. #29
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    Quote Originally Posted by ZRH View Post
    I can see RFIDs costing tons of money and no one ever looking at round counts except to fill out paperwork.
    Put an LED on it that comes on like a check engine light every X rounds or so.
    (up in the grip or something so it's not like a 'kill me here' light should it come on at an inoppertune time, but still somewhat easy to find if actually checking to see if its active, like during turn~in, draw, inspection arms drill, etc.)

    With the ever shrinking size of gizmonics these days, it might be viable for it to be 'smart' enough to spit out a trouble code for the light.

    Then make it so an iPod or simular device application could do the scan tool.
    Scanners could even be incorporated into arms rooms doors so that things 'auto scan' as weapons pass in and out and can potentially give a heads up (audible alarm from the scanner perhaps?) on weapons that might be approching a round count so that they can be serviced and reset before a deployment or goes out on patrol in a hostile zone.
    (disturbing I know, but christ, every kid in the world has some kind of handheld~whatever~device now and they can already read bar codes and credit card swipes, so put everyone on the 'lets keep after this maintenance cycle thing' bandwagon)

    Really loose example:
    6000 rounds expended, light comes on, code reader gives #'s for changing X parts and inspecting Y parts.

    ***

    The bolt:
    One might wonder if there was a way to eliminate the gas rings all together through reshaping of the piston of the bolt, but not require any stupid tight tolerance between bolt and carrier (bad idea for obvious reasons)
    The firing pin extension and machined ring on the bolt between the cam and lugs hold the current piston in line with the bore, so its not like they are doing anything more that sealing against gas expansion (oddly enough, just what they were designed to do) but with some subtle reshaping, like more sholder or pocket and less ramp those delicate little bits might be gotten rid of all together.

    It might seem a silly analogy, but it works well enough in Cox model airplane engines of roughly the same bore diameter, heat levels and WAY many more cyclic actions.
    Flipside of course is that the fuel of said engines also is continuously lubing the parts, but while the engine might see +100,000 revolutions in a single hours use mabe a million+ between inspections/rebuilds, the rifle is totally incapable of such rates of cycle so the needs wouldn't be nearly as high.
    Last edited by GTifosi; 06-01-11 at 09:40.

  10. #30
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    Quote Originally Posted by Robb Jensen View Post
    For the M4 carbine, Things I would change:

    1. Use a 16" barrel, 1x8 twist midlength cold hammer forged 11595-E steel barrel.
    2. Crane LMT/KAC SOPMOD or VLTOR E-Mod stock to replace M4 stock both are stronger and better than the M4 stock.
    3. KAC E3 style barrel extension and KAC style E3 bolt. Both have proven to last at least 4-5 times longer than Colt style AR/M4 bolts.
    4. Standard charging handle replaced with Type 4 or 5 BCM/VLTOR Gunfighter charging handles.
    5. CAR receiver extensions replaced with VLTOR A5 extensions and VLTOR 5oz standard A5 buffers. Buffer springs would share the same part number as the M16A2, A3 and A4 buffer springs.
    6. Finish on gas tubes, barrel extensions, carrier keys, bolt carriers, cam pins, ejectors, extractors & extractor and ejector pins, firing pins, hammers, triggers and disconnectors, safety/selectors, take down pin detents, safety/selectors detents and interior of inner of metal magazines and the inner and outer surfaces of upper and lower receivers replaced with a nickel boron finish.


    1. with melonite finish the entire barrel
    4. Type 4 or 5 BCM/VLTOR Gunfighter charging handles that are ambi
    6. with any exterior parts in a matte/non-reflective finish.
    7. move the forward assist up like on the MUR
    8. Bolt release like on the XCR/ACR (Ambi)
    9. Ambi-mag release.

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