As far as I’ve seen, if you want an extra-power stainless rifle spring, Tubb is your only option. If you find something else, I’d love to know.
Still, I had the impression that the A5 is a well-vetted, reliable system by now, so I’m surprised that it’s not working for you.
Maybe a bad batch of springs in the A5 kits? Do you have another basic mil-spec rifle spring to try?
I do see that you say the new lowers have been checked out. Just wondering out loud here, but could there be some weirdness with magazine catch so that the mags aren’t sitting quite where they should?
My experience with different buffer weights and others’ comments like this are starting to turn on a light in my head that after a decade of messing around with the A5 off and on, that it is, in fact, an overall more sensitive, less reliable setup than the carbine arrangement.
Last edited by 17K; 08-22-21 at 11:32.
JP makes polished stainless +10% rifle springs. I have one of their carbine springs and it's nice.
https://www.wingtactical.com/firearm...buffer-spring/
I have one in rifle length, and it’s indeed very nice, but I wonder about the stainless part. I see that claim on the seller’s website that you linked, but not on JP’s. When I enquired with JP, the response was that they use “rocket wire,” which is a high-performance version of music wire.
No need to throw the baby out with the bathwater.
WS6 had similar issues failing to feed after a reload with dirty magazines.
Issues were eliminated with the Green spring.
https://www.m4carbine.net/showthread...ey-to-and-away
Dropping down one step to A5H1 may also help chambering.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
Are these departmental or gov weapons, or just ones? I'm at a loss as to why someone would break up parts for a fully functional weapon system, but I've seen departments do some dumb things before.
You are stating a few things that aren't making sense to me. First, you say the upper are perfect, I can understand this comment based on previous use. However, you are also stating the lowers have no issues.
1. How did you come to the determination of there being no issues with the lower? Especially when most armorers are going to say that is the first area they would be looking for regarding troubles.
2. Who did the assembly of the lower receivers?
3. Who did the inspection of the lower receivers, and what was their level or training (or experience if untrained)?
4. How tight is the mag catch?
5. When you pull all the springs out and lay them side by side, and then put them next to a (preferably new) rifle spring, how different are they?
6. What buffer are you using? (if you listed it I missed it, sorry)
7. What happens when a standard OEM lower receiver is used?
8. How often does the issue replicate?
Stick
Board policy mandates I state that I shoot for BCM. I have also done work for 200 or so manufacturers within the firearm community. I am prior service, a full time LEO, firearm instructor, armorer, TL, martial arts instructor, and all around good guy.
I also shoot and write for various publications. Let me know if you know cool secrets or have toys worthy of an article...
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