Airsoftjunkiez is addressing performance issues with initial versions of the E&L ELT191 rifle, which were inconsistent in power output and lacked accuracy. According to them, to resolve this, MOS has developed a replacement spring kit that significantly improves the rifle's performance. For customers who purchased an E&L 191 from them, these kits are readily available; you can call them to acquire the kit or have them install it, as the upgrade is described as very easy to perform. The rifle is also compatible with the Ninja Remote Line for HPA use, which can be used with other models.