Selling a semi-boneyard Echo 1 ER25K, along with three high caps. In addition: Classic Army SR25 Gearbox Shell Classic Army SR25 Cylinder Unknown brand ball bearing spring guide SHS SR25 Gearset Original Echo1 ER25K Gearbox. Inside the gun is a full A&K SR25 Gearbox. [Pics n Timestamp](https://imgur.com/gallery/BK8k3Ml) Was testing fitment for the listed gearboxes in this gun since the original Echo1’s was not quite a v2.5 gearbox. Classic Army one fits fine, but I didn’t have enough parts to make a full gearbox. Resting inside is the A&K gearbox which functions fine, but won’t feed for some reason. Also, the gearbox’s hole that the rear takedown pin goes through needs to be widened a bit. Finally, the charging handle needs a new spring. Its problems are relatively easy fixes, but I no longer need this gun because I have another DMR. Willing to entertain trades of other guns that aren’t M4s or DMRs. Boneyards are also welcome. Selling for 150USD or trades. Paypal only.