I have the SP M40A1XB or the older version of XB... It has o-ring hop up and you can't adjust it.
Build quality compared with moderm guns
The hop up doesn't lose the setting, extremely helpful at very long games.
Rarity these days
Good accuracy when you find the "right" ammo.
Lack of spare/upgrade parts
It's not compatible with other guns, even with other SP versions!
It's near imposible to find mags
-During the ending of the classic era they bought things from the bankrupt classic airsoft companies like JAC.
-They attempt to bring classic airsoft guns back to popularity.
-They use the escort engine on their guns
-Use of BV like engine and a external gas system
-Use Marui magazines unlike other classic airsoft guns (rare mags)
-Uses way too much gas-> Poor gas efficiency.
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