Abstract: A modular firearm comprising an adjustable modular buttstock assembly. The buttstock assembly can include a frame with a central opening. A comb assembly having a cheek piece and a butt plate assembly having a recoil pad each can be mounted to the frame by an adjustment apparatus. Each adjustment apparatus can include of a guide post and/or a threaded adjustment post each received in respective bores in the frame to adjust the positions of the cheek piece and recoil pad. The adjustment apparatus also can include a locking or engagement feature that can selectively increase the friction between the frame and the guide post and/or adjustment post, to help prevent the translation of the guide post and/or adjustment post in the bore in the frame to fix the comb assembly and butt plate assembly in desired positions with respect to the frame.

Abstract: A modular firearm comprising an adjustable modular buttstock assembly. The buttstock assembly can include a frame with a central opening. A comb assembly having a cheek piece and a butt plate assembly having a recoil pad each can be mounted to the frame by an adjustment apparatus. Each adjustment apparatus can include of a guide post and/or a threaded adjustment post each received in respective bores in the frame to adjust the positions of the cheek piece and recoil pad. The adjustment apparatus also can include a locking or engagement feature that can selectively increase the friction between the frame and the guide post and/or adjustment post, to help prevent the translation of the guide post and/or adjustment post in the bore in the frame to fix the comb assembly and butt plate assembly in desired positions with respect to the frame.

Abstract: A modular firearm comprising an adjustable modular buttstock assembly. The buttstock assembly can include a frame with a central opening. A comb assembly having a cheek piece and a butt plate assembly having a recoil pad each can be mounted to the frame by an adjustment apparatus. Each adjustment apparatus can include of a guide post and/or a threaded adjustment post each received in respective bores in the frame to adjust the positions of the cheek piece and recoil pad. The adjustment apparatus also can include a locking or engagement feature that can selectively increase the friction between the frame and the guide post and/or adjustment post, to help prevent the translation of the guide post and/or adjustment post in the bore in the frame to fix the comb assembly and butt plate assembly in desired positions with respect to the frame.

Abstract: A modular firearm comprising an adjustable modular buttstock assembly. The buttstock assembly can include a frame with a central opening. A comb assembly having a cheek piece and a butt plate assembly having a recoil pad each can be mounted to the frame by an adjustment apparatus. Each adjustment apparatus can include of a guide post and/or a threaded adjustment post each received in respective bores in the frame to adjust the positions of the cheek piece and recoil pad. The adjustment apparatus also can include a locking or engagement feature that can selectively increase the friction between the frame and the guide post and/or adjustment post, to help prevent the translation of the guide post and/or adjustment post in the bore in the frame to fix the comb assembly and butt plate assembly in desired positions with respect to the frame.