Sacair Dagger

Left to Right, WA Magna P14-45, WA Magna P14-45 Mut, WA Magna HRT, and WA SCW HRT. PGG/SD/Sheriff/Guarder parts though out.

What Bevel gear do you have in your AEG? I like quiet.

Sounds like you have an air seal issue in your M4 more then a spring issue. I think the M100 should easily be pushing 365-380fps if everything is air tight. Might be as simple as changing the bucking out. Going up in spring rate just puts unwanted stress on your gb. IMHO What Motor did you install when you changed out the stock one?

TM M14 base gun with Trigger Happy EBR kit. VFC PEQ15 and RS Aimpoint T1 w/ LaRue mount. Only upgrades are a Prometheus MS100 spring, 6.03 inner barrel, soft bucking and a Guarder bearing spring guide.

Top AKM is a TM base gun with a RMW AKM kit installed. Lower AKM is a TM base gun with a Guarder AKM kit installed.

Megalomaniac, I glad you got your new ACR. It sucks to be that guy, I feel your pain. Let us know how it goes with the new stick. At least they didn't tell you "duct tape". I tease.

APS2 SV

My CAG stick.

Stock SOPMOD with a 8.4v battery was drawing 14-16 amps on a full auto burst. Very respectful amp draw.

I installed my RS LaRue absolute co witness T1 mount on the MagPul ACR and it fit perfectly. I would say the ACR top rail is very close to "mil-spec". That being said, if you own a "clone red dot" like Slayer750 553, with any type of throw lever mount, it may or may not fit properly. If needed you can always add some type of shimming material, (brass shim stock) works well between the rail and mount before locking it down.

I agree with Doedkoett , I think it's a "as needed" issue for the factory tech. to use shims or no shims when assembling the barrel on to the rifle. Sadly some of those shims "needed" where not installed. It's just like shimming a set of gears, you may only need a 0.010 - 0.020 - etc. under or on top of a gear or none at all. Just depends.

Snoopy and his ACR at "The NAM".

JBS, where did you purchase your ACR from? Great pics also, thanks!

There is a TON of info pages back to address all of these questions. Read then read again. LOL

Look back a few pages and read what sacairsoftsnoopy did to fix that issue. It's an easy fix if you or someone you know has done work on aeg's in the past or just understand how to fix things. Basically the foward hop assembly/outer barrel is twisted to the left making the bb's "hop" to the right. The unit just needs to be re centered.

Snoopy, Hey was just going through my parts box and saw some Outer Barrel Shims. Is there a way to shim the outer barrel forward causing more tension on the locking lug / lever??? That may solve any wobble issues with certian ACR's. Works great on standard Delta Rings / OB's. Just a thought. For the guys having problems with their hop not providing enough hop. If you can get your hands on the Guarder 50% Clear Bucking, get one. They are GOLD!!! Like Snoop said, you will have to trim about 1mm off the length on the muzzle end of the bucking so it will fit. I should have m

blablabla, I would highly recommend changing those *bullet type connectors* out and soldering a (Female) conector, maybe a deans or protek style on your Lipo. You are literaly playing with fire with that setup. Exsposed (+) is a HUGE no no. I've heard of houses burnt to the ground from fires caused by Li-Poly batteries blowing / thermal runaways. Just a heads up.