Albroswift

Tried out a Stern Defense Drop in FCG for blowbacks in the carbine, definitely not the feel of the SR Gold I have in the 308 but not bad for $139. 2lb+2lb 2 stage in its stock configuration. Comes with an extra green spring for a lighter "Not recommended for blowback bolts" setup, might try it in one of the DI guns, maybe it bridges the gap between $300 dollar "Breaks like glass" FCG's and Millspec single stage "creep, creep, bang"

Back from the range, final results in: 16" Carbine Sprinco red spring / 10 oz KVP tungsten buffer chewed through 180 gr plinkers, 180 gr major loads, and 155 gr 1500 fps+ with ease. Good "back on target" split times. 4.5" pistol Ditto above except for didn't run any of the lawman 155's From several trips to the range with various combinations, it seems to me a 10 oz buffer will run with several different spring weights, both pistol/ carbine, but a 7.5 oz buffer will only run in the pistol even with the EA1095 spring Slower cycling makes cheap mags work better, and factory mags work flawlessly. Springs I used from light to heavy KVP Extra Power 308 carbine Sprinco Red EA1095 Buffers: KVP 7.5 and 10 oz Just my opinion, but it seems possible to over buffer to the point that rounds will feed but bolt travel is insufficient to engage the disconnector, resulting in burst mode Also my opinion, it seems possible to under buffer to the point that the bolt speed is fast enough that either a. parts are moving so fast that the disconnector doesn't grab, or b. the effect of slamming into the "end of travel" jars the disconnector enough that it does not grab. Whatever the mechanics involved the results can be a bit bloody, out of battery slam fires and such, highly recommended to avoid at all costs!

Is that a commercial vs Milspec thing?

There goes the spending moratorium

My 458 ain't bad to shoot, buttstock makes all the difference Adaptive Tactical

In the middle of liberal-ville, Bellevue WA, you will find Lowpriceguns.com Little shop Quick service Lots of AR lowers very knowledgeable about the legal stuff, pistol builds, braces vs stocks, etc. Never been over 10 min for FFL stuff. I live in Seattle but nothing here, as bad as SF.

Envious is all I can say

Just read through your thread, 2 things jump out. Headspace and timing As you tried 2 different barrels, could it be the bolt causing the headspace issue? I'm relatively new to AR Platforms but been reloading since before the Clinton Administration and stuck cases and headspace issues transcend platforms I would be curious to try one of the spent rounds in a case gauge. May need to cut the neck off or neck only resize the brass to get it to fit. if the bolt starts moving back without the resistance of the shell, possibly could pick up enough speed to bend the bolt catch on the way back . Did you ever replace the extractor, or just the spring?

+1 on slower bolt speed making the cheapie mags feed better, even the uber cheap ones. Red spring maybe even better judging from last sundays data, although I didn't have an orange spring to try.

yes, southpaw shooter. Mag looked like a disassembled mag, didn't find the follower. Been thinking about it, 7.5 buffer works in 4.5 in barrel / ipsc 180 gr loads with KVP Extra power spring, Sprinco Red Spring, and EA1095 spring Rare double tap With the EA1095 7.5 buffer didn't work in 16" carbine even with EA1095 spring. 10 oz buffer works in carbine and pistol with Sprinco red spring or KVP Extra Power Spring. Occasional double taps with the EA1095/ Carbine. Didn't try 10oz/1095 in pistol I think with the 16in barrel the dwell requires a 10oz+buffer regardless of spring. Red spring /10oz buffer winner chicken dinner

pretty sure you can get anything to go off out of battery if you fuk around enough with it...

Mere flesh wound good data on the springs

Bloody range report AR40 Pistol and Carbine First tried red spring/ 10 oz buffer in the carbine. Flawless. Even a couple of the iffy mags functioned well. Recoil was sweet. Then took the EA1095 and 7.5 buffer out of the pistol which had been working well with the factory mags, and put the 10oz/ red spring combo in that. great results. Then put the EA1095 + 7.5 buffer in the carbine, had a couple of jams even with the glock mags, and like an idiot I kept going, until I had a lawman 155gr HP go off out of battery blowing one of the cheapo mag into its basic components and taking a chunk out of my chin. Blood everywhere, had to finish up the 2nd project of the session (springs and red dot on a glock) periodically blotting blood out of my beard and off the bench. To summarize, in 7" tubes, 15.5 oz Stern Defense BCG: RED Sprinco/ 10 OZ buffer excellent functioning combo for pistol, carbine EA1095/ 7.5 oz buffer good in pistol, although same combo in the other pistol we built this year did have some double taps EA1095/ 7.5 oz buffer NO BUENO in carbine. Curious why worked with 4.5" barrel with 180 gr IPSC loads but not 16" barrel with 155 gr +P, all other things equal. Forgot to try the red spring with the 7.5 oz buffer, a little out of sorts after the blow to the chin. Looking back from the 50 yard berm

Mild handloads are fine with the right powders. You probably know most /all of this but I like talking reloading Just need enough pressure to: 1. Inflate/ seal the brass to the chamber 2. Get a clean burn 3. Cycle the action- after achieving 1 and 2 here is where I would start messing with different springs, but usually don't need to unless going uber lite. I have had good luck with Titegroup for medium recoil auto loads, leaves a gray coating on the crown but burns clean at medium recoil loads. There are a lot of other powders that fit the bill as well. My medium 45 load is 4.5-4.7 gr Titegroup 230 gr Xtreme round nose 1.265 COL 4.5 gets a little under 700 fps in the Kimber Ultra Carry 4.7 gets a little over 750 fps in the full sized. manageable recoil and accurate. And economical. Cleanest powder I've used is VV3N37 in autoloaders but need to load mid to upper end. (Costs more and uses more, but clean and snappy) Clean up with dry patches.

Got the red spring, it is longer then the extra power JBO/KVP 308 spring, shorter then the EA1095. Got it in the carbine with the 10 oz buffer, report back tomorrow hopefully.

When reloading smoke and soot are typically indicators of under pressure rounds. Maybe the Winchester is a reduced recoil load? 45's are a finicky breed, full power 230 gr ball ammo 1.265 - 1.275 COL always works, every gun I've tried it in, every time. Every thing else may work fine, may not, depending on the pistol. If it was me, I would try different ammo before messing with the recoil system, even if you get it to function, you still have smokey sooty rounds.

I'll take the brass please. I use it for 25-06.

I built an ar-40 pistol and an ar-40 carbine because I had 2000 rounds of xtreme 180 gr pills on the shelf, and a lot of primers, brass, and powder laying around...

That buffer is badass, probably the 120.00 could be better spent elsewhere though. In 2 different builds this year the EA1095 spring was just a little bit heavy even with 7.5 oz and 10oz buffers ($34.00-$54.00) The heavy duty 308 carbine spring (KVP not Sprinco) is maybe just a little light, excellent function but the buffer bumper takes a bit of a beating and can be felt in the recoil. If the red spring was half way between it would probably be about right. Free shipping, no tax, got one on order right now! Let you know...

at the risk of becoming a troll I'll say I ran through a couple ea 15 and 22 round Factory Glock new gen mags today absolutely 0 issues. First feed to lrbho. waiting for the 22s to go on sale.

* 10 oz Tungsten 4-1/8" buffer

OK, tried the carbine today with: Extra power 308 carbine spring 7 in tube 10 oz KVP 4-1/8" stainless steel buffer Glock gen 4 22 round and 15 round mag 155 gr Ranger HP ammo / 1500 fps Flawless operation off shoulder, fed perfectly, no double/ triple bursts, LRBHO BUT a little more felt recoil then the 7-5/8" tube and the EA1095 spring. Buffer bottoming out for sure. Still peppered the 100 yard target. Seems like a reliable combination, just be replacing buffer bumpers occasionally.

I thought that was the 45 with the chipped receiver.... .40 bad feed... 45 single shot... now I'm confused...

The range loves to point out shortcomings. Gravel pit can be an even more brutal master! As I've posted elsewhere, the 40 does not like cheap magazines. I'm sure you will finger everything out!

SGM mags will also suck in a 40. Who's barrel did you use? Seems like the 40 is a lot more tempramental, magazine wise. New gen glock mags work the best. Also the no-name 31 rounders from Classic Arms work 99% RWB GL40-31MAG. While the BCG is small enough that it won't ram the ears of the receiver if it goes back too far, it will be traveling a lot farther and therefore faster when it strips the round then I think would be ideal, I think you want to limit travel to about 1/8" past bolt catch. I would suggest heavier buffer and spacer or get the longer buffer style. Here is a typical spacer if you don't have tools to turn your own one: These are a couple samples for heavy buffers pistol caliber length from Joe Bobs: (1) KVP 7.5oz Stainless Blowback Buffer (1) KVP 10oz Tungsten Blowback Buffer This is a another option to the Sprinco spring: (1) KVP Extra Power 17-4 SS PCC Spring