AGM M14 upgrade

Hi, I chronoed my M1 (made from an AGM m14 ) on Saturday at 273 FPS - (it was 328 out of the box) - and am planning to give it a bit of an upgrade this week : spring, nozzle, bearing piston head and spring guide.

Would a M110 spring put too much strain on the gears?

Cheers

Ranj

The AGM guns are fitted with steel gears, so it won't be that much strain on them. If you want to get to 328fps or thereabouts, an M100 will be more suitable. An M110 will take you between 350 - 370 fps or more with the other upgrades you have planned. Also, be sure to add metal bushings to your list, as the nylon ones won't last as long with upgrades and it makes more sense to only open the gearbox up once and do all of the upgrades at the same time. You'll also find the AGM gearbox packed with god awful grease, so make sure to give it all a good clean and relubricate it all with good quality stuff.

My AGM M1/m14 has also had an upgraded M100 spring and a tight bore barrel. Makes it excellent at long ranges and fires at about 330fps...although im planning on removing the fire selector and making it single shot only, so i will probabaly get a few more upgrades done. Get it closer to 370-400fps

But then where would there mosfet fit? There's not really enough room in the stock for it

Sorry to hijack slightly Ranj. Biguk, 370 - 400 fps for an aeg? Bit hot, isn't it? Whether you use it single shot or not, there is no bolt to cycle and you can whack a dirty great hicap on it as well, which I think, is kind of not very fair, considering those of us who use 400 - 500 fps rifles have to cycle a bolt and are limited by our magazine and/or gas capacity AND minimum engagement distances. You say that you already have good range and accuracy, so why up the fps?

Sorry to hijack slightly Ranj. Biguk, 370 - 400 fps for an aeg? Bit hot, isn't it? Whether you use it single shot or not, there is no bolt to cycle and you can whack a dirty great hicap on it as well, which I think, is kind of not very fair, considering those of us who use 400 - 500 fps rifles have to cycle a bolt and are limited by our magazine and/or gas capacity AND minimum engagement distances. You say that you already have good range and accuracy, so why up the fps?

I only use 8 round ACM Shotty mags in my Garand. So using a Hi-cap for me is out of the question, and is no way realistic for my chosen weapon. With regards to the accuracy...i would like it to have a bit more range..So that i can deal the same blows as you guys with Gas k98's that are firing at 500 fps.

With the Mosfet im using a RS garand stock and its already tight on the internals, worried that if i cut too much out..the stock will become brittel.

Before this all gets out of hand......

ANY high FPS Airsoft gun can cause pain when used by irresponsible players. Note the word "irresponsible" there, because so far, I have yet to see any player at a CiA event being purposefully irresponsible.

Now, regarding magazine capacities, shouldnt the K98 be 5 rounds?

I'll go down to 5 round if the smg's go down to 30!

Btw, I did post on this thread prior to this post but deleted it, as I didn't want to come across as argumentative.

I was drafting a comment on this fps thing but everyone else posted first so I'll just say I reckon, that in my humble opinion, for simplicty's sake, all AEGs should be subject to the same limit- in most engagements, (other than those with no cover to speak of like Mt Etna ) the rate of fire on single shot AEG makes up for the range difference, and 8 x 400 fps BBs is really gonna smart!

Anyway, if I can have my thread back - I've got a guarder SP100 on it's way for mine but it occurred to me that when I chronoed the gun on Saturday the mag I used might have been loaded with 0.25s. That could easily acount for a drop in velocity but would it knock off about 50fps? Ah well, I'll have a spare spring.

Anyway, I take it a mosfet is some fancy gizmo to make an AEG single shot only? Are they easy to fit? Why would that be more reliable than something mechanical?

MOSFET's are just solid state switches. Far more efficient than the mechanical switches used in the average AEG.However, you can do some quite groovy things with them, like active braking, and being far more efficient they also pop your rate of fire up a bit as well.

Systems like the "trigger master" mentioned by hopeless are a lot more complicated as they are basically programmable systems that you set up to your preference (burst fire, semi only etc etc)

Plus, disabling the mechanical fire selector means that once it jams on single shot, which it will, you'll have no way of switching to auto to clear it.

There is a way round that, in fact, one manufacturer (STAR) does that with their semi-auto only SLR.

Basically, you have a microswitch wired to the battery and motor that totally circumvents the normal trigger switch. With the STAR, you simply drop the magazine out, hold down the plunger on the microswitch thats hidden behind the magazine well, and you get full-auto, allowing you to deal with the gearbox lock-up. Is there space to do the same thing on the M1?

I doubt it...Depends where its places...Maybe in a cut down M14 stock..but as im using a RS Garand stock..im not so sure

Anyway, if I can have my thread back - I've got a guarder SP100 on it's way for mine but it occurred to me that when I chronoed the gun on Saturday the mag I used might have been loaded with 0.25s. That could easily acount for a drop in velocity but would it knock off about 50fps?

328fps = 100m/s
273fps = 83m/s

Energy = 1/2 mass x velocity squared (mass in kg so divide 0.2g or 0.25g by 1000, velocity in m/s as above)

For the 0.2g bbs at 328fps
Energy = 0.5 x (0.2/1000) x 100 x 100 = 1.00 J

For the 0.25g bbs at 273 fps
Energy = 0.5 x (0.25/1000) x 83 x 83 = 0.86 J

So to answer your question, the drop in fps is a bit more than predicted by my schoolboy physics, but not a great deal more.

If your gun really is still bang on 1J you could expect about 89m/s with 0.25g bbs, which equates to about 290fps. It's probably just dropped off a bit with use.

Thanks for that info, your schoolboy physics is better than my schoolboy physics

Well, I'm going to give it a full workover (as soon as the bushings arrive tomorrow) and I'll see what it's doing on Saturday.

Okay, I've doen the upgrades :
Sp100 spring,
Metal Bushings
Aluminium piston head,
Deepfire piston.

But the gun (dry) fires a few shots then stops. I took the motor off the check the gears were moving, replaced it then it fired a few more shots and stopped again. When it fires it whines like the motor s adjusted to high BUT there is no motor height adjuster on this rifle!

My plan is to swap some shims around on the bevel gear to move it away from he motor's drive gear slightly, obviously adjusting the shimming on the other gears if I have to. Sound reasonable? Any advice/suggestions would be welcome as I am hoping to set off for "Pocket" tomorrow lunchtime.

Thanks

Ranj

Definitely check the shimming Ranj. Best way to do that is to put the shims on and reassemble the box, but leave out the piston, cylinder, spring and spring guide. That way, you can use the end of a flat screwdriver to push the gears round and check that they spin freely. It's also much easier this way to tinker with the shims if need be because there's no spring to go flying. Once you're happy with the shims, you can re-insert the other parts and try firing it again. I may be teaching you to suck eggs, but the timing of the gearbox is all important as well, even more so if you're going to use the weapon on single shot a lot. Also, it's worth checking that the pinion gear on the motor is secure.

it's alive! Mwhahahahahaha!

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Thanks for the advice. The gears had been spinning freely before last time I put it together, but swapping some shims out from the left side to the right side seems to have the gears sitting more evenly in the bushings now. I made sure the sector gear was aligned properly too (something I didn't pay attention to when I last reassembled it) so either one, or both of those things (probably the latter) sorted it out. Now it fires BBs accross the spare room with a satisfying thwack. Hope they have a chrono tomorrow.

Cheers

CHThree