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Nice timing. Although you didn't specify which rifle. There are a couple of versions of the SP M40. So if you could specify which one that would help. I've been searching for upgrade parts all day today because I'm about to get an M40XB. Here are some upgrades I found for the XB, mostly from WGC.

600fps Upgrade Kit (I'm pretty sure this would tear your rifle apart

)
http://www.dentrinityshop.com/pr_details.jsp?pid=4305

Tapered Cylinder Head
http://www.wgcshop.com/pcart/shopper.php?itm=PDI-PT-M40XBTCH_cat_PDI%20Parts

Adjustable hopup for M40XB
http://www.wgcshop.com/pcart/shopper.php?itm=PDI-PT-M40XBHUC_cat_PDI%20Parts

If you're into gas sniping: Gas Bolt
http://www.wgcshop.com/pcart/shopper.php?itm=OK-PT-M40-GC_cat_OK%20Parts

Parts for the XB and the A1.
http://x-fire.org/bolt/2004m40/m40top.html (found by Livonia)

The down side is shipping costs and potential customs headches :-/

What headaches can you have for importing little pieces of metal? He's asking about upgrades.

 

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I have a SP model 700 spring rifle that I'm toying with the idea of selling it ,
But now i see a gas conversion out there I'm not sure what I wanna do now

Do you know if the M700 mags will fit in the M40XB? Does anyone know if the M40A1 mags will fit in the M40XB?