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Sorry I didn't see this until just now. I recently took apart my clone (identical to your gun) and had the same problem, but thankfully figured it out.

SR10 Buckings fit.
VSR10 upgrade trigger sears fit (pps/action army) however, they must be shimmed. I.E. place shims between the trigger box and receiver on top of the screws.
APS2 Springs, Spring Guide and Piston fit.
Action Army Hopup Chamber fits, however, mags need to be modified.
Add DIY barrel spacers as well as the stock one.
Couple of notes - stock barrel is bridged, so to fit a ML bucking you'll need to cut it down. Even when you do this, the bucking probably will stick out into the feeding chamber a bit. I cut mine down, but in retrospect it would have probably fed even without doing this. Stock bucking seems almost completely ineffective - I got the same distance (240ft) out of both .36g and .4g bbs with the stock gun, hop up maxed. Meanwhile, with a 70 MR Hop bucking I can now lift .46g well past 300ft.

This spring is longer than the stock one, and makes the gun noticeably louder because of it. It did allow .4g bbs to fly out flat to at least 250ft, instead of having to lob them.

This kit does not fit other than the sear itself, which does work in the stock unit.

Stock hop up unit is almost identical to VSR10, but has bucking slot on opposite side. This may require cutting down your bucking.

I made a playlist of useful videos regarding the gun that you can find here: https://www.youtube.com/playlist?list=PLbBcQaDdqeQX4dqnZ4hkxbJQasePuNzB-

I too am planning on doing a review/upgrade video soon here. Honestly, between the spring and the hop up I don't think anything else needs to be done to the gun. Someone else said it here first, but I'll copy them - the gun is sleeper. Less than $150 into it and it shoots like a laser out to 250ft easy.
 

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New to this forum and an Airsoft "Sniper" roll in games, but not new to Airsoft.
Have read thru this thread and a few others [ASG M40A3 Sportline Upgrade/Mod Guide] about upgrades to a "starter" rifle, in my case I recently bought a 2022 Double Eagle/Matrix M62/M40A3 from Evike (I spend way too much $$ money there) just in case I'm not cut out for a sniper roll.

I get some conflicting answers from others whether the DE M62/M40A3 is actually the same as the
ASG M40A3 Sportline, and consequently take all the same upgrade and mods in the same way?

I'm anxious to coax out a consistent 500 fps with a .3 to .35 BBs, get more range and I've got to tackle the trigger. Out of the box my new M62/M40A3 has been pretty consistent at 420 - 430 fps and flat and tight patterns at 250ft, no strays after I pulled off that damn orange muzzle cap and carefully beveled the barrel muzzle. Also experimenting with a modified version of a "suppressor" I designed for my .177 steel BB M4A2 I shoot in Run n Gun practice for the real powder burners. Seems the suppressor also helps fps a few %, and even improves flight trajectory of plastic BBs too. Surprised at that.

Would appreciate any input on how much if any the DE/Matrix M62 is akin to the ASG. Or, if any of ya'll have modded the DE?

Thanks
Capt.(ret) USAF 20th SOS Green Hornets, 27th Spl Ops Wing., Nam 1970-73 USAF 1968-1988 Resv.
[Ya, I'm 73 and still shootin']
I'm almost 100% certain the M62 is the exact same gun as the M40A3, as I've yet to see a single component difference.

I was not able to get any more performance out of the gun with upgrades than with stock, and got the same performance as you stock.

The only way to improve the gun is to get more power out of it - something I was unable to do. The only thing left to try is to get an APS2 cylinder, shave it from 90 degrees to 45 degrees, and then get something like an SSG spring so it would work in the gun and get more power. This was the only thing I did not try - all else failed.

FWIW, you can run .4g bbs in the stock gun and get very good accuracy to 230ft, but that will be the start of drop-off maxed out. A good hop up won't increase range much if at all, but will improve accuracy a bit more.

To summarize:
  • This gun requires more power to shoot further, but I was not able to accomplish this due to the proprietary piston design.
  • Do not waste time or money upgrading anything but the power, as I can attest all the normal upgrade paths people swear by here did nothing for my gun.
 

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I should add a few details I left out.

There is an upgrade spring marketed specifically for this gun that increases the FPS by about 50 for a short time. The DIY spacers I got (see my video) boost FPS by about 10, but you can only fit one in.

The cylinder is APS2 spec, but because the piston only accepts 11mm OD springs - currently only found as VSR type - you can't up the power by putting longer springs in. My (two) SP170 springs were super hard to cock but barely getting to 480. This is why I think you might have to replace the piston so you can get an actual APS2 spring in that is 13mm OD. That's the only thing I can figure. Problem with that is trigger is 45 degrees, so you either shave down the piston ( as a few have reported they've done successfully) or attempt to convert the trigger group to 90 degrees.

Weighing down the piston did nothing for me but drop FPS across all bb weights.

If you do decide to mod this rifle, that would be the path I'd recommend you try. I would love to hear your results, especially if that ends up being what brings the power up.
 

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The upgrade spring won't hurt the gun at all. It will drop power pretty quickly, tho. I've had an upgraded spring in my gun for over a year, and I know others who have had them in for 2-3 years no issue.

My gun has had an SP170 spring in it for about 6mo+ now and other than the very difficult bolt pull you wouldn't know. My previous gun was over 500fps unupgraded and the 45 sear was fine - what finally broke after all these years was the sear housing, because it was made of super cheap pot metal and made too thin. Needless to say I'm not sold on the whole "you gotta upgrade the sear" crap.

The gun is great for the price point, and ideal as an entry sniper. I have had great success with it, but when the 250+ ranges become critical for survival, not being able to increase the power on the gun really hinders it.

I know nothing of the trigger group, tho I'm told the Facebook group has made some progress on that front. Waste of effort and time until you sort the power problem, IMO. You need an APS2 spring which all seem to be 13mm OD - this in turn means you need an APS2 Piston, but those are all 90 degree. Best route would be to shave the piston down to 45 from 90 and see if that allows the power to trend up.

If that works, then I'd drop a Mr hop bucking in, consider dropping the upgrade sear I listed in my post, and the finally consider upgrading the trigger group.

If you do end up getting the power over 530FPS let me know so I can copy you! I've tried everything else and had basically no success.

Here's the vid
 

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I ordered that ST spring even tho advised against it, $8 NBD if it doesn't work, save it for something else. I've seen some references to a trigger group for this DE/Matirx/ASG etc etc bunch of the same rifle, but haven't watched the YT vlogs to see the details. Let you know what I find out, maybe try.

I think I'll try the piston + spring route and mod it to 45 degrees. Again, let u know what happens here.

Well done video on YouTube, good sound, explanation, etc, just gotta turn your phone sideways to get a wide aspect ratio video for computer and TV screen, more stuff to see in the frame. Enjoyed it and learned. Thanks

Were you getting consistent fps when your M62/M40A3 was stock over time, or was there a drop-off with use??

I've been testing with only .30gr BB's, but I do want to get up to using a .36gr to worry less about leaf, twig or wind gust deflections in flight.

Thanks for all the input.
Gun chronoed 480 new, then dropped to 410-430 after a game or two. Upgrade spring chronoed maybe 480 first game, then settled in to 440 range. SP170 480, settled in 460 range.

With the stock barrel length being circa 450mm and aps2 cylinder .40 or above bb's should be usable with a better bucking and good seal
Gun can lift 4s flat to 230ft stock, and that's the weight I recommend. Seal was not great stock but made very little difference from my testing even when I got full seal. Mr hop seemed to ever so slightly increase usuable range (10ft tops) but did seem to make a worthwhile improvement in consistency.

The flaw with this gun is getting consistent shots past 230 ft. You need more power for more range, and built DMRs and LMGs will eat your lunch in your effective range. Even ARs will shower you with ammo. I really do think if we can figure out the power problem this gun will sing, but I don't have time to tinker with it anymore.
 

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Have you tried replacing the stock seal on the stock piston, or cap yet? If you have, what did you use and from where?

I'll experiment with .40 BB's, but I think I'll stay with something eventually in the lower .3_ range.
Now the concern with getting "found" but AEG AR totting berserkers and getting showered dead, is a 3-man unit: shooter, spotter armed with an AR and a 3rd watching out for you from 3 to 9 o'clock, especially your 6. Loan-man sniper is a "movie fiction". I see these SO guys practicing all the time at Camp Pendleton USMC, and I was in USAF Spl Ops Wing in the 70's - 80's and it was done that way even in that ancient history.
Yes, see everything I've done here
 

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Mucho grassie a$$, an exceptional posting and more information than the manufacturer supplies! Thanks thanks thanks!

Say, on your BBTac, is your clip right in front of the trigger guard or much more forward like the Matrix/Double Eagle and a few other private labled of the same rifle? That seems to be a indication of who really made it. If I'm correct the older "McMillan" M40A3 has the feed right in front of the guard.
Clip is far forward (no feeding ramp into the hop up). Typical airsoft design, which is what you want. I've torn apart nearly everything on the rifle - excepting a few pieces of the trigger assembly - and have seen no difference in parts versus the M40A3 discussed here.
 
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