Need Help Increasing Accuracy of My Tercel M007 Rifle

[Jsquared]

Hi everyone!

I have just received my first long(er) range rifle and I am perplexed as to how the accuracy can be improved. I know that the hop up adjusts the spin of the BB to make it fly straighter but I am not sure how much if any it should be adjusted. Out of box, hop-up off, she fires 490-500 fps (0.2's). This is a little high and I am going to bring it down. The first few shots with no hop-up shout out and veered down to the left or right. I turned the hop up to about half, the shots stopped dropping as much but still would not go straight. I turned the hop on full and shot and It was slightly more accurate but still fired at about 470 and was not hitting my target. The target that I had set was out back about 50-60 ft away.

Does anyone have any information on how to make the gun more accurate? I know I will have to adjust the scope eventually, but how can I get better, if any, grouping?

What parts should I swap out?

Is there any specific cleaning that I should do to aid the accuracy of the gun?

Any and all help is appreciated! Thank you in advance - J2

[disasterarea]

That's a VSR clone, isn't it? I'd google the specific name of it, you can usually get some good stuff that way.

[slink182]

Remove the hopup/inner barrel assembly and look down the barrel, hopup end. Adjust the hopup wheel and see if the bucking is moving up/down and the rubber bump is visible in the barrel. If the bucking isn't moving up/down, there may be something wrong with the tension arm. If it's moving, then the issue may be with the rubber's nub being damaged.

Test fire your rifle outdoor on a sunny day so you can watch the BB's trajectory. Adjust hopup until it shoots flat for 40-50m. Too much hopup will cause the BB to fly out and curve upwards. Too little, and it will just drop.

There is also the possibility that your sights are just off - 50-60 ft (10 m) is pretty damn close, though. You should be hitting your target at that distance.

Based on your description, it sounds like your airseal is solid, and since the rifle's a BA, I can't imagine a double feeding issue.

[Jsquared]

I can watch the BB's Fly. like i said above, when there was no hop they curved down and left or right, with hop up on full they were going a fair distance straight but veering off at the last little bit. I think I need to use heavier bb's to start with and possible bring down the fps and see what it shoots like then.

[coach]

remove the hopup rubber. clean with mild dish soap and warm water. dry and reinstall. while you're at it, clean the inner barrel. they can often come from the factory full of dirt and grit.

next, move to a heavier BB. you will not get any significant range w/ accuracy with .2's.

[slink182]

Apologies - the original description sounded like you were suffering poor flight behaviour at 50-60 ft. Yes, try a heavier weight - 0.28/0.30/0.36 - cross breezes will have a greater affect on lighter rounds. You will need to adjust your hopup to counteract the heavier weight, tho.

[Jsquared]

how do you properly clean the Inner barrel?

[slink182]

Cleaning rod (one sized for a .22LR will fit), cleaning patches and silicon oil.
Fit a patch to the cleaning rod (same way you would fit one if cleaning a regular gun), spritz it with silicon oil, and run it down the barrel just short of the hopup rubber. Pull out. Repeat several times, replacing patches as necessary, until the patch comes out clean.

If you run the patch past the rubber, it may become damaged or coated with oil, in which case you may need to either replace or clean it.

[lurkingknight]

I've read .2s become slightly unstable above certain velocities, so the advice to go with a heavier BB is a good first thing to try before ripping things down, if you're not accustomed to doing it, things can get lost when you take it apart.

[Jsquared]

Thanks Guys! I will defiantly try the heavier bb's when i get out of this lecture >.< (fluid mechanics ftw?).

Just as a side note to lurkingknight. the second day that I owned my first gun (ak 74m) I had to swap out the spring. I opened up the gear box not knowing what would happen and everything shot everywhere. I found all the parts and was able to reconstruct it. I have since opened up all my pistols and actually look forward to opening the m007 (the above mentioned sniper). I love to tinker and I know stuff gets lost :P. when i took apart my pistols, which I still have to post a fix for in the doc forum, i lost a small spring about 3 mm in length, luckily i found it yesterday while cleaning my room ... talk about lucky!

[m102404]

BB's are very much affected by any cross winds. There's NOTHING that will correct that...it's inherent in the system. Some setups are better than others, but they're all affected the same by the wind.

If you've got a good distance to shoot...say 100' or so...with a decent back drop (usually treelines) so you can see your BBs then take a bit of time at the next game to set up your rifle/bb/hopup. There's no other way to do it without the range to see what your BBs are doing.

Now...if you're getting a pronounced and consistent hook/slice...then your hopup nub might not be centered. That'll show up pretty evidently. But if you're getting a gradual/variable (with the wind) slice/hook at the last 3rd of your range and the first 2/3rds is about as straight as you can tell...then you're probably setup ok (at least to start).

Heavier BBs will reduce the deflection from the wind...but won't eliminate it. 0.30's will still get pushed off quite a bit in winds.

When you're setting up...forget looking through the scope when you're setting your hopup. You're just looking for the flatest/furthest shot you can get. Once that's done...then zero your optics to match up where your shots are hitting. Zero in close (say 30'), it's easier to get on...then fine tune for further out.

You need to set your hopup for each BB weight (and between brands). Start with 0.30's. Trying to zero and adjust hopup with light bbs outdoors is just approximate.

[lurkingknight]

yeah, the o-rings in the fill valves of my pistol mags shot out while diagnosing accuracy issues on my 226... I found 1 of them... have to find a source for new ones. my m14 gearbox exploded when spring swapping and I spent about 2 hours more trying to figure out where the tappet spring was really supposed to go. I can rip apart and reassemble the gearbox in my oddity p90 in about 5 minutes now and I like to tinker, but it doesn't mean I like to do it over and over again :P

I'm lazy, so if something can be fixed without taking things apart, I tend to go that way first :P

[Jsquared]

It was defiantly not a wind problem :P the yard I'm in is long and rectangular with fences on both sides. and there was no wind in my area yesterday . Plus the bb's were splitting left and right it was not consistent by any means. I do think that it was more about the bb weight itself, but i will keep in mind that even a breeze can effect the trajectory of the BB.

[Jsquared]

CLOSED! Wow I must be some sort of special >.< I put the .28's in (like i should have tried yesterday) and its night and day .... they shot straight and true it was amazing to see the difference! Thank you to everyone that Contributed!

p.s I am still going to clean the hop-up and the barrel as its proper gun maintenance.

[slink182]

Originally Posted by Jsquared

It was defiantly not a wind problem :P the yard I'm in is long and rectangular with fences on both sides. and there was no wind in my area yesterday . Plus the bb's were splitting left and right it was not consistent by any means. I do think that it was more about the bb weight itself, but i will keep in mind that even a breeze can effect the trajectory of the BB.

You may still be getting wind effects. Depending on how close/tall your fences are, they may be creating a structural downwash affect in the space between them if the wind is crosswise. (You may learn about them in your fluid mechanics course. BTW, I work mainly in air dispersion/atmospheric modelling, so I'm quite familiar with structurally generated turbulence.) The only sure way to minimize wind effects is to either (1) pick your outdoor ranging day carefully or (2) range indoors in a large/long space.

G'Luck!