biglou13

I've been thinking about this low mass BCG question. ( my job requires driving) Ultimately the true test will be build 2 equal rifles, all same components and tuned.... With the exception of low mass bcg. ( I think this would be a great test for a shooting TV/ web... I'd be glad to produce it) My theory is that Tuning the BCG reciprocating action is all about controlling the deceleration. I'm no physics wizard ( I dropped that class) but a lot of what we are discussing is about force, and decreasing the force. F= m x a. Alter mass and/or acceleration you affect the force. My theory or thoughts on this is as long as you alter the acceleration appropriately the mass becomes secondary.. F=m x a So consider the moving parts ( bolt, BCG, buffer) ( if you want to get really technical spring,cartridge weight) as Mass or m. The adjustable gas system, buffer spring system as a or acceleration. F equals the force of moving parts influencing muzzle rise, recoil, perceived recoil. In the case of heavier bcg as long as you adjust the a or acelleration. You can maintain same reusult in force!! I'd still test a low mass BCG eventually, but for now my $200 plus dollars is better spent bourbon and bullets..... Ps. I can't believe I just used algebra today!!! My science and algebra teachers would be proud!!!! PPS.... If you want to really get deep throw friction into the mix, trigger resistance, bolt and trigger interaction.(something I'm working on).But the biggest thing you can do to affect muzzle rise is to tune the nut behind the trigger but that's a different conversation.

FP should be a longer coal. In a cz. And longer than most other mullet profiles. coal is specific for each different barrel.....

I can't get link to work Google taccom .223 recoil. Carbine system is a bit different. Buffer spring is light weight I believe 10%. Then spacers are used in steps to provide reliable strip and lock up. ( could do this cutting spring a home made spacers) I'm usin taccom buffer. The rifle length I haven't weighed yet but carbine is .06 ounce for moving part I don't imagine rifle legnth is significantly more. I'm pretty sure this is the lightest weight buffer available. I always thought bolt bounce was an full auto issue .... I haven't experienced it..... You have recall the stoner design was for military / full auto,...... I imagine stoner is rolling his eyes at the mods being made now Another minor issue is trigger.... And of course the major issue... The nut behind the trigger.

BOOM.... i'd add to you 3 part list .... bolt forward movement... it is often missed tune. (with rifle pointed in safe direction) hold stock rifle in good un-supported position have a friend release bolt , strip round from full magazine and lock forward..... what happens to sight picture???? to tune utilize minimum buffer spring force to strip cartridge chamber, and lock bolt..... A. i think of the rearward motion as one part both hitting the back of tube and locking back since both of these items are tuned via tuning gas block or gas key. B. I have tuned forward movement of bolt with http://www.taccom3g.com/223-adjustable-recoil-system.html along with enhanced light weight spring, minimum forward energy and deceleration via tuned buffer spring . not to mention also dampening the forward movement C. bullet leaving with good muzzle brake In response to OP looking at A. the reward motion is tuned / controlled/dampened already, i think adding the light weight BCG will add only minimal improvement. I will eventually test a low mass BCG. but i feel that current efforts are sufficient without light weight BCG. newtons 2nd law force equal mass x acceleration.... gas key tunes the acceleration , mass is tuned via buffer, and BCG but i think the tuning process is about deceleration vs acceleration i recently completed a build and testing these systems by shooting with stock/ mil spec components 1st, then tuning forward movement B. and shooting a few rounds, followed by A. shooting a few rounds... then finally adding B. shooting..... (i believe this is running the ragged edge of performance, these mods are not what stoner engineered, reliability will decrease with these mods.... but that's another discussion)

Good info biged.... So how an you tell if it's the case diameter vs shoulder causing issue? I have a Wilson and Dillon .233 case gauge..... I'm interested in jp gauge. I always assumed case gauges were cut by reamers.... And red is cool too. I discovered my mistake!!! I used a dial mic stand and measured. Yes you guys were right. Some were .0005 to .0015 too long Cheaper version of dial indicator stand. http://www.midwayusa.com/product/310955/rcbs-case-master-concentricity-gaging-tool Mistake one Trusting others to prep your brass. I bought brass cleaned sized de primed swaged, trimmed, chamfered, deburred ... I measured a handful which spec'd fine. Did'n't measure more. I did not resize when loading assuming all is within spec. I'm now checking brass prior to reloading Second mistake is to use case gauge in poor light, with ailing aging eyes..... I used to be able to see .+001. As of today I have become a "scraper" (scrape top of case gauge with straight edge) I will always wear my " cheaters".

Heads?

Yep that's the one .... 20 round version..... I got it used I'll try cleaning I'm glad I'm not the only one who thinks it is tight

I used to load on Lee press and dies. For 9mm. For a short period ran Lee dies on Dillon I'm now using Dillon/Dillon and feel like I'm getting more consistent/ better reloads. Than any of the of the above You'll prolly get better advice in reloading forum....

Anyone.......anyone...... Beuhler....... Anyone.......???

Thanks all great advice... m going to revisit an review re measure my reloading process..... Thing is every loaded cartridge passed case gauge ..... I'll recheck remaining rounds from that batch with dial gauge with case gauge Is ballistic advantage Hanson barrel known for a tight chamber?

Can't say from experience ...... But gas key is on BCG is easily serviced...... So I'm inclined to say no. Rep..... I'm going to try a drop of kroil. Mine isn't frozen just crunchy.

Paul. Dang block freeze is problematic. I got my syrac used...... It's a bit crunchy on the turn but I got it used. I'd think you'd get more rounds if before freeze? Are you using a "dirty powder"? If mine freezes I'm planning on ultrasonic cleaning it.... However it's a P.I.T.A to remove and reinstall... Chances are if I remove it I'm putting on regular block. Then switching to key block. Curious... How often do you clean rifle? I wonder if cleaning gas block down and soaking will help? What are the pro's doing? Are theirs freezing also?

Bwi... And Dillon.... Please clarify. Dillon case gauge does or, does not measure shoulder bump? videos and Dillon says it does measure shoulder bump.???? If not what points does it gauge? I have a case comparator to measure shoulder bump/ datum line en route. I'm too trusting thinking that my brass was previously prepped appropriately.

Depending on block and hand guard, gas tube length , barrel profile. ... That could equally be difficult to adjust. Adj key pretty easy to access bolt and the adjustment Allen key is larger... Plus my eyes are going ....

I have both. Gas key and block on 2 different builds. From reading the gas blocks will eventually get dirty and possibly freeze up eg. No more adjustment...... Should you decide to clean it involves removing gas block... I just recently started using gas key. From tac com. Which is made my rubber city armory... Easy to install ( less than 5 min) and easily cleaned. Performance wise I can't tell difference between the two. I can't tell that more gas is passing key area. I'm sure rifle will be dirtier but, running all these upgrades its almost necessary clean and lube gun more often anyway. Easier to maintain and less expensive. I'm going with adj gas key on my next build! Yes you have to pull bcg to adjust gas. I had it set in handful of rounds. I've heard of ocassional failures but those are due to user error, not tightening and or not using lock tite.

I just acquired a double alpha case gauge. And the tolerances on this are much tighter than Dillon gauge!! I have rounds that fail the DA gauge that pass the Dillon. And chamber and shoot fine. The failure to gauge in the DA gauge us about 8%. While Dillon gauge is approx 2% At this point I have stopped culling brass, and there is no trend with head stamps with the DA failures. My failure rate of rounds that pass case gauge is so low I can't remember last time I had a issue less than 1 in 1500 Do I change my ways to satisfy the DA? Why should I? I really don't like culling brass? But may if I ever compete seriously. I feel like my Dillon 550 and dies are set up well! But I'm questioning if there is room for improvement? And what are the people that use the DA doing that I'm not???

Lake city. 1x, I bought the brass swaged sized trimmed and clean I ran some though all Lee dies on Dillon 550. No fcd / 4th. Some just loaded as bought. Empty case legnth is fine, And empty cases case gauge fine also. I don't have shoulder comparator device yet. My load is on lower end of book. I'll get back to you with load. Dillon case gauge. I do have a Wilson is that one tighter? If it's a loading issue I'm willing to make changes. It was damp. Not wet..... But I'm rethinking running wet. I did add some oil over previous slide glide and oil. I'm going to give it another solid cleaning before next test.

For my hands and grip, it would not be correct to say that they were 'uncomfortable' in stock form, 'very very painful' would nail it right down though. Last digits of the strong hand middle and third fingers just did not like being mashed into sharp edged holes. I also can't figure supplying an $85 dollar aluminum grip without two $0.06 lock washers and I think the supplier was partying heavily when they dreamed up the add hype (apparently these grips will make you a grand master without practicing, help you lose weigh while eating anything you want, and make you more irresistible to the opposite sex). Niggles aside, after a $0.93 total investment (two grommets and a couple lock washers) they seem to help me position my hand higher and I'm anxious to spend some time with them. Grommets seem like they want to stay in place so far, would like to find a blem and play with some jb weld to fill the holes in place of the grommets just to see if I liked that better. can you post pics of mods it is uncomfortable but it lets me know my grip is on point. couldn't find the rough neck pattern cab u post a link? haven't tried the 2.0 the 1.0 is plenty grippy

no name upper with m4 ramps ballistic advantage barrel 16 inch hanson profile.223 wylde rubber city gas key tac-com rifle alw buffer/system enhanced spring mil spec no name bolt/bcg xbr powder 55grain dillon case gauge less than 30 rounds through barrel i started tuning a new AR (ish)/m4gery. forward bolt movement is tuned properly gas key is tuned properly failures: i had a few difficult to extract loaded cartridge had a few failure to return to battery FTRB: The FTRB were with one specific magazine and only when loaded with approx 5 rounds or less NO FTRB with 20 round mil spec mag NO FTRB with full mag at this point I'm writing this off to mag failure will retest with another brand magazine never had issues with stock pmags and mils spec al mags difficult extraction: shot cases were extracting fine, bolt cycles fine only had difficulty in extracting occasional loaded rounds, from FTRB's and manually cycling bolt with loaded cartridge if i recall i believe these were with same "problem" mag i literally needed to pull charging handle with both hands to extract please advise? RO suggests dirty chamber, due to dirty powder. i'm thinking cursed magazine I'm also thinking new barrel/bolt needs break in.... is XBR considered a "dirty" powder? any ideas or suggestions and i'm sure some of this is may be break in issues. i understand and accept that "upgrades" can decrease reliability

i have a syrac. and have no complaints? (no no comparison to other mfgr) why did you choose gas block vs adjustable gas key? are you also going with lightweight BCG, light weight buffer, tuned buffer spring?

any one running burris fast fire or the like ? for 3G (ish) with AR-F3? (or the like) I'm liking the smaller/micro optic any other protective /riser options? (i didn't like cheek weld mounted low on riser) opinions /advice please

1/8 will stabilize 62 an 77 grain bullets well and 55's with decent accuracy i think the 1/8 is a more appropriate twist rate for 3G 1/7 will work but you may need to handload and test to get better accuracy with lighter pills yes on re zero. with any bullet weight change, mfgr change, powder change, primer change............

http://skidtactical.com/store/guntec-15-m-lok-rail/ i just bought this for a 3 gun ish build. 10.6 oz weight including nut made in usa m-lok price is user friendly (i can make load more bullets and drink more bulleit) started breaking it in today.... very light swings and stops well, i expected it to feel bigger in hand but it felt very good with c grip, and i felt i could control better price wise its budget, not a big name company. i don't see any design flaws, i dont love the bolts that attach tube to nut, nut seems delicate but its light weight, just slowly work up to final torque. i bought a slight blem could not find blem shipped super fast

id consider a light weight buffer system, I'm partial to tac com. i'd loose the DPMS buffer i've been doing a lot of research on the tac com systems /buffer and will post a write up tomorrow. in a nut shell you not getting maximum tuning for forward energy on bolt /buffer movement. +1 on good brake i'd say that solves the lion share of muzzle rise.... i went with a JEC/holland like brake, lots of options here.... my shooting neighbors hate me but i love watching hole get made on paper....... that trifecta looks good i like some holes on top of brake i feel like it provides some downward force,,,,, i try shooting different ones till you find the ONE 77's for 3 gun $$$$$$$$? im going to throw a flag on that play..... i'd think about a 1/8. im not saying 1/7 wont work, 1/7 is for reach out and touch someone.... but your going need to do some serious hand loading and testing for lighter weight pills ( im currently testing 55.62.7 for a 1/7 on my first build) i don't compete yet but do you really need a collapsible stock. how often does 3 gun include CQB course of fire....?? why 13" vs 15" hand guard?? optic/s???? there a lot of high dollar parts there???? im guessing 1.3K + without optics . but I'm bit frugal, I'm under on $900 budget my v 2.0 (3 gun ish). I put my dollars and research first on barrel then brake, gas block buffer system, (light weight bcg later)....... went with as much cheap parts as possible... at first its relatively easy to build so changing parts in future is pretty EZ.... ' if you planning on hitting up some black rifle matches i'd consider a sling and sling adapter/attachment how do you compare using c grip vs AFG?

i had same issue for a bit i polished a few surfaces and some dry lube no issues i'm writing it off as break in ..........