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  1. M

    .17 Rem AR15

    I've built maybe 8 of them in the past. I didn't have any issues at all with them and they shot very well. The gas port needs to be properly sized, usually running .005" or more smaller than the 5.56's. I worked my way up from .070" or so and if I remember right got great function in the high...
  2. M

    Gunsmithing Lathe Chatter; using PTG action jig for tenon/chambering.

    Make a unitized fixture with a new backplate and that fixture attached directly to it. I made one w/ a 1" thick 6" diameter flange bolted to a backplate and don't have any problems. I've made several of these and used heavy walled DOM steel for the tubing portion. I have 5 or 6 steel discs...
  3. M

    Heavy bull barrels and FF handguard fitment issues.

    Some barrel nuts will let you get away with 1.050" on the barrel diameter, others only 1". If I run into that problem I just chuck the barrel nut in the lathe and open it up to the needed diameter.
  4. M

    Gunsmithing Hobbyist equipment, 3-1 granite Mil/Lathe/Drill press?

    Shorten your learning curve and look into the NRA sponsored summer gunsmithing courses offered at Trinidad, Murray State College, and several others. Every summer they offer a machining for gunsmiths course and rifle re barreling, usually in consecutive weeks. That and local vo-tech may offer...
  5. M

    What a cool idea

    This stub works very well for two things... One it allows you to measure exactly where your bullet will touch the lands without chambering a round in the rifle... And also measuring the amount you are setting back the shoulder when sizing. It is cut w/ the same reamer and same barrel....what...
  6. M

    6.5 Grendel Reloading question

    When I build precision AR's, I take a cut-off section of the barrel blank used on the rifle and run the chamber reamer in up to the shoulder/body junction. It takes all of a few minutes and then you have a perfect chamber guage without trying to chamber rounds in the rifle itself.
  7. M

    Gunsmithing Does rechambering/setting back a barrel give it full life again?

    Some of the very best shooting AR barrels I've had (6.5 Grendels) were used tubes. I took shot out high-power barrels which were generally 6.5-284's with well over 1500 rounds down the tubes (mostly Kriegers). Some barrels had firecracking for 4-6" past the chamber. Take one of those barrels...
  8. M

    Gunsmithing should i loctite the barrel extension and other good knowledge please

    I'm not talking about using locktite on the barrel nut and threads on the receiver, only on the surface of the barrel extension that slips into the receiver. I use moly grease on the threads. The locktite has absolutely no affect on any torque that is applied to the barrel nut. Red locktight...
  9. M

    Gunsmithing should i loctite the barrel extension and other good knowledge please

    It's not so much the holding property of the locktite that helps IMO, but the filling any gaps and creating a better fit that would have less tendency to shift between shots. I've replaced a few barrels years after locktiting them and believe me, that shit still had a good hold. Most of the...
  10. M

    Gunsmithing should i loctite the barrel extension and other good knowledge please

    I discussed this with an Army equipement specialist years ago about the time we started fielding the M110, and he stated to me that Knight ended up 'bedding' or epoxying the barrel extensions in the uppers just as you describe in order to meet the accuracy requirements. I had been building many...
  11. M

    AR-15 Eject Help

    If you assembled yourself, make sure the gas tube is not installed upside down...I know it sounds stupid but I've seen it a couple times.
  12. M

    .338 Snipe-Tac Build

    Pretty sure the bolt is .750... I have a 1.400 dia. Stiller SS 408 action here. They also make a 1.600" diameter action. One thing you don't realize is the lugs on these actions are about twice as long as a standard action boosting the shear strength by a goodly amount. DO NOT use any...
  13. M

    GAP-10 6.5 CM-- heavy cratering, heavy swipes, and 2 pierced primers with factory ammo

    I built one on a DPMS upper but had to utilize the entire Armalite bolt carrier group. The Armalite bolt, due to the FP spring/FP will not fit in a DPMS carrier...at least that is what I remember from a project 2 years ago or so. I recognized I would rather just use Armalite bolts as I had a...
  14. M

    GAP-10 6.5 CM-- heavy cratering, heavy swipes, and 2 pierced primers with factory ammo

    Mil spec or otherwise, it doesn't make sense a smaller tip not being able to ignite a heavier primer cup. There would be more pressure/penetration w/ the smaller fp tip. One problem is, and this is a good thing, is the Armalite doesn't have the free-floated firing pin and has a spring...
  15. M

    GAP-10 6.5 CM-- heavy cratering, heavy swipes, and 2 pierced primers with factory ammo

    You need a lathe to do it. Basically you bore a recess in the bolt face and press/thread/soldier a blank of steel in the bolt face and then re-drill a smaller firing pin hole in the bolt face. Then you chuck up the firing pin and turn the tip down to match. This might be a problem with the...
  16. M

    GAP-10 6.5 CM-- heavy cratering, heavy swipes, and 2 pierced primers with factory ammo

    My experience (only 1 month ago) was the fp hole size/fp. Wasn't so much the overall clearance but the overall size. Bush the bolt face and turn down the the fp to .068 or so and the problem will be solved. My issue was with a SPR action (larger fp hole/fp) with lapua brass that uses a small...
  17. M

    GAP-10 6.5 CM-- heavy cratering, heavy swipes, and 2 pierced primers with factory ammo

    The issue is too large of firing pin and firing pin hole....most likely just the bolt having too large of fp hole and too much clearance w/ the firing pin. I recently built a 6.5x47 lapua on an SPR action and had pierced primers on almost every round. I ended up bushing the bolt face and...
  18. M

    good gunsmiths?

    I've got both the Grendel and the LBC reamer and could fix it for you if you'd like. Have it back to you in a week or so.
  19. M

    Bergara custom rifles any feedback?

    Ed Shilen supposedly helped them refine their technique in and acted as an advisor for manufacturing barrels. They are honed after reaming with vertical sunnen hones that are 'supposedly' very precise. I think they rate pretty high for a factory barrel in quality, but probably don't equal the...
  20. M

    Your methods of aligning gas blocks

    I use a bore scope! Perfect every time.
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