Using this M4A2 solid dummy replica is straightforward. You can adjust the 6 - point collapsing stock to your preferred length for a more comfortable hold. The 1 - 1/4″ swivel sling mounts are great for attaching a sling to carry the replica easily. When using it for training, don't use excessive force that could potentially damage the over - molded metal barrel. For maintenance, simply keep it clean and dry. Avoid exposing it to extreme temperatures or harsh chemicals. If you notice any signs of wear or damage, it's best to have it checked.