Angry Bull discusses the potential benefits of upgrading to the Hi Capa 5KU Lightweight Aluminium Frame. This frame, constructed from CNC 7075 Aluminum, features an anodized matte finish and a 2011 marking. With an approximate length of 160mm and a 20mm bottom rail, it also boasts an improved hammer housing version. This version includes a stainless steel sear, valve knocker, and pin set. Notably, this frame is suitable for the Marui Hi-capa gas blow back pistol.

RST Airsoft in Taiwan got this video showing how one can replace the lower frame of the a WE Airsoft Glock-style GBB pistol... "Today, the RST or Red Star survival game store will teach you how to repair/replace/modify WE GLOCK Series Replacement Lower Frame Tutorial Basic Modification."

Extend your Tokyo Marui Hi-Capa 5.1 to 7 Inches with this new custom design from Nineball at Laylax. The NINEBALL Tokyo Marui Hi CAPA 5.1 Custom Lower Frame R EDGE 5.1 ​​inches + Compensator allows you to do that without changing the 5.1 slide itself. It is made of aluminium alloy and fits the Marui Hi-Capa 5.1 series excluding the Gold Match.

Now available at Laylax is a Crimson-coloured Lower Frame and Compensator for the Tokyo Marui Hi-Capa 5.1 Gas Blowback Pistol, the most customised airsoft pistol of all time. Made of Aluminium, the lower frame extends the pistol to 7 inches whils still allowing the 5.1 slide to fit and the compensator is vented with holes on three sides and over all these are lightweight and give exquisite balance to the pistol.

Now in stock at eHobby Asia are the "Art of Stippling" series from APS. Take your selection of GBB Pistol Lower Frame for the APS ACP601 and ACP A CAP pistol grips or pistol grps for the M4/M16 AEGs, APS ASR Tango, and even a pistol grip with a QD sling attachment. Prices range from US$25.00 to US$36.00.