[fuzzywolly]

so i have put almost 10,000 rounds through this gun, from what i've read that's a lot, and i need to upgrade the spring but i can't seem to find something that tells me how, i found a good spring but i won't buy it until i can figure out other parts that i should get and how i need to upgrade it.

First off, welcome to the forum. Glad to have you with us. Please start capitalizing the letter "I" as well as posting with some decent grammar and punctuation.

Now that I am finished with the moderating business, on to the question at hand.

You are going to want some durability parts to help prevent that spring from damaging your rifle. This includes the following areas that need to be reinforced/replaced with higher quality parts...

-Trigger unit
-Piston
-Spring guide
-Cylinder head (not 100% necessary but an option)
-Cylinder itself (I have actually been using my stock cylinder for over two years without a problem. Its your choice. You may or may not be able to get away with keeping this in stock form.)

 

[fuzzywolly]

Check out airsoftatlanta.com for a boat load of parts for your bolties. It is where I do the majority of my part shopping.

 

[fuzzywolly]

The SD 700 is a clone of the VSR. The parts should in fact fit. I believe an older member here (not sure if he still is active) upgraded one using VSR parts. He would be able to confirm it for you.

One of many sources: http://airsoftpacific.com/viewtopic.php?p=593660

 

[fuzzywolly]

There are plenty of triggers on airsoftatlanta that fit the VSR. There is the laylax and PDI triggers, which despite being more expensive, are totally worth it. I would save up for one of those.

The sears in your SD trigger box are more than likely not just metal, but pot metal. Unless your box shell is sturdy enough to hold up for a longer period of time, new sears would be useless. I put in a new sear in my l96 trigger box, only to see the actual shell break. However, if the SD has a solid shell, and money is tight, go for the sears instead.

 

[fuzzywolly]

As long as the outer shell is metal, that is a plus. If you replace the sears, which is much cheaper, and your outer shell can handle the wear and tear from usage, than you should be good for a while. You see, mine was plastic, so the outer shell gave out on me despite having PDI trigger sear in to increase durability. I did not bother with the piston sear or spring guide stopper seeing as eventually my box would crack.

Basically, see how long your box can hold up in stock form. Once a sear snaps, replace it with a new, higher quality one. There is no need for a new box as long as the old one can hold up. However, its nice knowing you have a really nice box in there that is not going to give out on you.

Post 1500.

 

[fuzzywolly]

It all depends on your rifle's fps and other variables. For instance, a .12 gram bb will not go near as far as a .25bb with a rifle shooting at 300 fps. The .12grams will just fly off in all kinds of directions, while the .25grams will be able to go straighter over a longer distance.

 

[fuzzywolly]

Ok, now that makes it make much more sense. Well, looks like I'm getting some madbulls. So for 500 fps should I use .3g.

I would recommend heavier bbs if you are going with a 500 fps set up. I have always liked the .4s from madbull, but .36s are nice as well. .3s seem to light to me based on your fps set up, but its your choice in the end.