Buffer spring

[NightStalker]

Does the Grendel need a heavy buffer spring?

[js8588]

No. If I'm building something with an adjustable stock, my default preference is Strike Industries Carbine Flatwire buffer spring. If I'm building something with a fixed stock I go with either a Tubbs Flatwire or a Damage Industries chrome silicon spring.

Just my preferences, YMMV.

[NightStalker]

The flat wire is stronger than normal springs?

[A5BLASTER]

I haven't found a need to use extra power springs. But I also use a adjustable gas block on all my guns.

Bill designed the grendel to work with standard ar parts, so it should run with standard weight springs.

[Klem]

Does the Grendel need a heavy buffer spring?

No, a normal spring will be fine.

[NightStalker]

I noticed a scrape in my receiver from the cam pen. I know this to be a timing issue but don't know if if happened before i put the adjustable gas block on it, thought I would put a heavy buffer spring in it then readjust the gas block

[Mesa1978]

I've used JP SCS standard spring and standard AR buffer springs, both work fine.

[js8588]

The flat wire is stronger than normal springs?

A bit stronger but the selling point for me is they have a much longer service life.

[Klem]

A bit stronger but the selling point for me is they have a much longer service life.

I have never seen a buffer spring fail...what happens?

[NightStalker]

It gets week causes feeding malfunctions can mess with timing issues like dwell time.

In the civilian world i dont think the rifle is shot enough for an issue. It could happen with competitive shooters but for the most part i dont think we shoot enough.

[js8588]

It gets week causes feeding malfunctions can mess with timing issues like dwell time.

In the civilian world i dont think the rifle is shot enough for an issue. It could happen with competitive shooters but for the most part i dont think we shoot enough.

Yeah, I'm a guy who just bought an Aimpoint CompM5 because it's made out of 7075 vs 6061 in a T2 or H2. I'm an enthusiast, not a professional. I'll never need the extra durability, I just want it. Same concept applies to all my gun related purchases. I'd probably never need to replace a standard buffer spring, but for a $20 premium, knowing I'll never need to replace it is worth it for me. As always, ymmv.

[Klem]

It gets week causes feeding malfunctions can mess with timing issues like dwell time.

In the civilian world i dont think the rifle is shot enough for an issue. It could happen with competitive shooters but for the most part i dont think we shoot enough.

I've used them in the military and again, never heard or saw this. "Dwell time", with respect, that is starting to draw a long bow. How often civilians shoot relative to disciplined bodies is speculation. One can be convinced a concerning problem exists in order to justify the different and more expensive type of springs. And how do you know flat springs are a "bit stronger" than MILSPEC? I'm playing Devil's Advocate here to sift out the shiny but questionable kit and marketing hype.

You could invest the difference in an adjustable gas block instead. Stick with the cheap and cheerful MILSPEC spring and fine tune the pressures on the whole recoil system.

I have seen guns prepped for storage by releasing the buffer allowing the spring to expand forward. The buffer will rest against the released hammer. Then push it back in when you use it.

[stubshaft]

FWIW - I use Tubb flat wire springs in my AR's, and have never seen a need to go to an "extra" power spring.

[NightStalker]

What started this concern was a mark in my receiver I recognize as a timing issue, again i dont know if this happened before i put the adj block on or after, I suspect before.
As for Military and the buffer spring, alot of times that spring was replaced without you knowing during annual calibration.
As an Armorer i replaced them quite often, it was cheap insurance

[NightStalker]

I wasn’t trying to upset anyone just wondering if the 6.5 needed a stronger buffer spring. Please don't take it any other way guys

[montana]

What started this concern was a mark in my receiver I recognize as a timing issue, again i dont know if this happened before i put the adj block on or after, I suspect before.
As for Military and the buffer spring, alot of times that spring was replaced without you knowing during annual calibration.
As an Armorer i replaced them quite often, it was cheap insurance

If you believe it is a spring issue, install a new recoil spring or try the JP SCS kit. https://www.jprifles.com/buy.php?item=JPSCS2-15K I agree with Klem and I have never seen a buffer spring fail.
Is the recoil spring an inch or more shorter than a new one??
Do you have any marks on the top part, back of the lower receiver where the buffer tube screws into the lower receiver??"Looking for impact marks of the BCG..
The barrel extension could be canted..
Bolt cam pin hole is begging to stretch??
Out of spec upper receiver BCG channel??
Direction and recoil of ejected brass??

[centerfire]

I use a Sprinco Red spring in my Grendel but I have a fixed gas block. If I had a adjustable gas block I would probably use a regular spring. I think I have most, if not all, of the aftermarket springs on the market, I like the Tubbs the least.

[js8588]

I use a Sprinco Red spring in my Grendel but I have a fixed gas block. If I had a adjustable gas block I would probably use a regular spring. I think I have most, if not all, of the aftermarket springs on the market, I like the Tubbs the least.

I'd rather mess with springs & buffer weights than an adjustable gas block. I have a bias against adjustable triggers & gbs as they just seem like an unnecessary risk of an added failure point.

Curious as to why you like the Tubbs the least other than they're a comparative pain to install?

[centerfire]

I'd rather mess with springs & buffer weights than an adjustable gas block. I have a bias against adjustable triggers & gbs as they just seem like an unnecessary risk of an added failure point.

Curious as to why you like the Tubbs the least other than they're a comparative pain to install?

Pain to install, noisy, and doesn't do anything better than lower cost solutions.

[js8588]

Pain to install, noisy, and doesn't do anything better than lower cost solutions.

I find them less noisy than stock (or the Damage Industries CS spring), but otherwise, fair enough. The JP SCS (and knockoffs thereof) fall under the same reliability concerns for me as adjustable triggers/gbs/& bcgs. That's just me, though. I'd never tell anyone else it's wrong for them.