I just got one in the mail. I’ve been running my BCM 16" Carbine with an H3 buffer with no issues. I was curious to see if I couldn’t run the Sprinco red spring and maybe back down to an H2 or H buffer.
The red spring measures 11 7/8" Is this acceptable? Its noticeably more powerful, does an 1/8" really give it that much more push? The BCG travel seems to be completely unobstructed. I’m eager to get get to the range and see what happens.
I was trying to step down to a lighter buffer on one of my builds also and tried one. It did not seem to make a difference in ejection pattern from a standard spring. Other have posted the Wolf XP spring is much firmer and will make a anctual difference, they are cheap also.
Whats wrong with a standard USGI spring and an H buffer?
I think the red spring is a little too angry, but that’s just me.
Nothing. Since I’m already at the end of the spectrum with an H3 buffer, I’m just wondering at what point will I have lock back and/or feeding issues. In other words, how much more can I slow down the BCG before I run into problems.
If the idea is to use the heaviest buffer that still allows the bolt to lock back with the weakest ammo you shoot, I’ve run out of buffers to go any heavier with.
I will say this: This weapon has only been fed PMC M855. I may pick up some .223 UMC to see if I can push the limits of the buffer weights.
I’m seriously confused…
But I do have a special H4 Buffer with a purple spring that I only sell to specific people that have a high need. Cost is only 200 bucks. PM me if your interested, it will solve all your problems.
This makes a great deal more difference in full auto than it does normally. I know some of you love your heavy springs and buffers (in carbine extensions) but the closer you tune it to the ammo the more possible problems you might have with weak ammo and even just basic friction. -.-
When I’m not so tired I’ll look for a spring supplier that sells these at retail. Then you can get each N/m rate. 
I’m a big fan of the Sprinco springs in general; I have a red one in my S&W15 along with a H2 buffer. It really works well in that rifle, significantly improving the recoil impulse over the stock spring and car buffer. Absolutely no feeding issues with any kind of cheap ammo, including that awfully weak Tula shit. M&Ps of course are notoriously overgassed though.
Reason I like the Sprinco’s is that standard springs wear out - Sprinco ones don’t. Worthy upgrade for a high volume shooter IMHO.
Which is absolute bullshit. All springs wear out. They are piece of metal under a cyclical load and will all eventually break.
The mass/spring system in your buffer tube is not for adjusting the recoil to your pleasure. It is there to ensure reliable functioning under all conditions.
Allow me to rephrase. According to manufacturers claims the duty cycle of Sprinco’s springs is in excess of 750,000 cycles. So not forever…my apologies. :rolleyes:
Is is true? No idea, as I only have a measly 12,000 rounds on my red spring, give or take, and less on the others I have. I am doing my best to break it though, and when I do I’ll be sure to report. Visually, however, it is still as long as the day I bought it, showing no signs of becoming compressed as happens with regular springs. I have yet to hear of one failing, whereas with standard GI springs, there is plenty of noise about them starting to cause problems as early as 4000 rounds. Quite a difference.
But - If anyone does have a Sprinco spring that has failed on them, please chime in and let us know, I’d be interested to hear.
So I suppose that my measly 12,000ish rounds of shooting all ammo including shitty weak Tula without any issues at all doesn’t count then. Reliable functioning has obviously been compromised :rolleyes: And, sorry for adjusting the springs in my own rifles for my pleasure. I’ll do what I want, thankyou, sorry if that offends you.
Listen, if the springs affected my reliability in any way, I wouldn’t use them - but of the 4 springs I have (one “green” (rifle), two “blue” (standard carbine replacement) and this red (extra power) one - I have had no issues with any of them. Just to reiterate, I shoot around 1000 rounds of 223 a month, so I’m not guessing at the effect on reliability here; in my rifles, for my usage, they have been 100% so far. Any problems, I’ll be sure to let everyone know.
For you just to dismiss them out of hand because you don’t like the sound of them…well, that’s your prerogative of course - but if you really want to poo-poo them with any degree of credibility, I’d suggest giving one a try and then coming back and relating your experience to us.
The gun doesn’t even last that same order of magnitude.
You can do what you want.
You also will be challenged on here for suggesting aftermarket parts that have the potential to comprimise the reliability of the weapon.
The integrity of the information posted on this website will be upheld for the reliable function of professional combat grade weaponry, not what a spring manufacturer claims.
Expect to get jammed up on this website for suggesting aftermarket parts when the OEM has no issues, especially when dealing with the spring, buffer, and bolt carrier group.
Ver
Exactly! Hence my ‘forever’ comment 
Scott, I think we will just have to agree to disagree on this one. Whether I’m challenged or not - also fine, but as I mentioned above I’m not doing ‘hearsay’ on these springs, I’m doing my own very extensive reliability testing as outlined, and I’ll let everyone know how it goes.
Mileage may vary and all that applies.
These nonsense aftermarket springs have no place in any serious gun. A gun that won’t run correctly on a USGI SS spring should be repaired or replaced.
I have fixed a couple of rifles recently by replacing the “extra power” action spring with a standard one. I am also sceptical of most aftermarket gun springs in general.
Just locking back on an empty mag does not ensure reliable function in adverse conditions. For an example look at the difference in M4 performance from two different batches of rifles and Colt’s response regarding the cyclic rate of the tested rifles that did not test well.
I can’t find the thread were I asked, but I do remember Iraqgunz saying that he runs a blue sprinco spring in his sbr. Since you shoot with him maybe you already know this?
I don’t want to put words in his mouth, but it seems they do have their place.
Using the red spring is nothing more than an experiment. If it causes problems, its one variable, and I’ll swap it out.
I use a sprinco standard rate blue spring with out any troubles for about 2k now on it the factory lmt buffer spring went out between 1500 and 2000 rounds my thought is that’s kinda shitty pistol recoil springs have always lasted me longer than 3k .
This issue of buffer springs comes up every week on this forum.
Rsilvers showed me a document about 17ph treatment I believe that’s the name of it. [ sorry if I got it wrong] any ways its the treatment for SS springs that is supposed to extend the life cycle of them its called for in the milspec maybe my LMT buffer spring wasn’t up to spec and that is why it went out at so quick. I have resolved to my self that when ever I get around to purchasing the Vltor A5 buffer system I will also put in an order to SAW for a colt rifle length buffer spring to go with it and give it a fair try. If it last to at least 3k I will probably stay with it. I will feel better using a SS spring that wont have any rust issues but I also don’t want to be changing out buffer springs twice a year.
As far as changing to a stiffer buffer spring I think its a bad Idea the engineers didn’t pull that spring rate out of thin air its been tested far more than any of us could do for the system. Another thing adding more resistance is going to increase the felt recoil plan and simple.
Just look at what pistol competitors use the lightest recoil spring that they can get away with.
I don’t agree with the statement “aftermarket CS springs have no place on a serious use gun”
but I don’t believe they are better than SS springs. I personally use USGI springs now, and this is AFTER using Sprinco springs. (Red + H3 in my first Knight’s 11.1’')
There are different kinds of CS springs though, some are amazing, some are pure dog shit. C Products for example…
Stick with Colt Defence, replace them every 5k rounds. (Seriously… it takes 45 seconds.) And you will be well served.