Tubular K Frame Identification

Look at their reviews, many comments on failed welds. May want to look at adding some gussets to help strengthen some of those areas especially where the angles are exaggerated, anything welded less than perpendicular is a weak point just through the physics of it all. Look at roll cages that have odd intersecting angles, any reputable chassis builder installs gussets.
That being said if you do your due diligence you should be ok.